Word list · B1 Intermediate
B1 vocabulary list
192 words at B1 level, each with pronunciation, a plain definition and a sentence showing it in use. B1 covers most everyday topics. Around this point roughly 95% of ordinary spoken English is words you already recognise.
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- 1
abate
/əˈbeɪt/To become less intense or widespread.
The storm began to abate after several hours of heavy rain.
- 2
aberrant
/æˈber.ənt/Departing from an accepted standard or norm.
The aberrant test results prompted the scientists to recheck their equipment.
- 3
access
/ˈæksɛs/A way or means of approaching or entering; an entrance; a passage.
Most people use their phones to access the internet.
- 4
ad
/æd/A short form of advertisement; a notice that promotes a product.
I saw an ad for the new phone online.
- 5
admire
/ədˈmaɪər/To regard with respect or warm approval.
Everyone came to admire the beautiful sunset.
- 6
aged
/eɪdʒd/Of the age of; having lived a particular number of years.
The contest is open to children aged eight to twelve.
- 7
annoy
/əˈnɔɪ/To make someone slightly angry or irritated.
Loud chewing really annoys her.
- 8
approximately
/əˈpɹɒk.sɪ.mət.li/Imprecise but close to in quantity or amount.
...approximately 60 beats per minute.
- 9
average
/ˈæv.ər.ɪdʒ/Typical or usual; calculated by adding amounts and dividing by their number.
The average temperature in July is around thirty degrees.
- 10
bake
/beɪk/The act of cooking food by baking.
bake (something) to bake bread/biscuits/cookies
- 11
ballast
/ˈbæl.əst/Heavy material placed in a ship to ensure stability.
The ship took on additional ballast before the ocean crossing.
- 12
barnacle
/ˈbɑːr.nə.kl̩/A marine crustacean that attaches itself to underwater surfaces.
Barnacles covered the hull of the old fishing boat.
- 13
base
/beɪs/The bottom part of something, or the main place of an organization.
The lamp has a heavy base so it won't tip over.
- 14
basic
/ˈbeɪ.sɪk/Simple and most important; forming the starting point.
The course teaches basic cooking skills.
- 15
basis
/ˈbeɪ.sɪs/The main reason or foundation for something, or the way it is organized.
She visits her grandmother on a weekly basis.
- 16
battle
/ˈbæt.l̩/A sustained fight between large organized armed forces.
The battle lasted for three days before a ceasefire was declared.
- 17
better
/ˈbet.ər/Of higher quality or more suitable than something else.
This restaurant is better than the one we tried last week.
- 18
bite
/baɪt/To cut into something with your teeth.
Be careful because that dog might bite.
- 19
bloat
/bloʊt/To make or become swollen with fluid or gas.
The heavy rain caused the river to bloat dangerously.
- 20
bludgeon
/ˈblʌdʒ.ən/A thick stick with a heavy end, used as a weapon.
The attacker used a bludgeon to break through the door.
- 21
blunder
/ˈblʌn.dər/A stupid or careless mistake.
Sending the email to the wrong person was an embarrassing blunder.
- 22
board
/bɔːrd/A flat piece of wood or other material, or a group of company directors.
He nailed a board over the broken window.
- 23
botch
/bɒtʃ/To carry out a task badly or carelessly.
The plumber managed to botch the simple repair.
- 24
brand
/bɹand/A conflagration; a flame.
a well-known brand of toothpaste
- 25
brave
/breɪv/Ready to face danger or pain without showing fear.
The brave firefighter rushed into the burning building.
- 26
bride
/braɪd/A woman on her wedding day.
The bride wore a beautiful white dress.
- 27
bubble
/ˈbʌb.əl/A spherically contained volume of air or other gas, especially one made from soapy liquid.
champagne bubbles
- 28
calm
/kɑːm/Not showing or feeling nervousness, anger, or other strong emotions.
She remained calm even during the emergency.
- 29
candid
/ˈkæn.dɪd/Truthful and straightforward; frank.
She gave a candid interview about her struggles with addiction.
- 30
celebration
/ˌsɛlɪˈbɹeiʃən/The formal performance of a solemn rite, such as Christian sacrament.
The occasion was the 40th anniversary celebrations of the orchestra.
- 31
central
/ˈsen.trəl/In or near the middle of a place or thing; most important.
The hotel is in a central location near the station.
- 32
chain
/ˈt͡ʃeɪn/A series of interconnected rings or links usually made of metal.
He wore a gold chain around the neck.
- 33
challenge
/ˈtʃæl.ɪndʒ/Something difficult that tests your ability.
Climbing the mountain was a real challenge.
- 34
claim
/kleɪm/To say that something is true, often without proof.
He claims he finished the work on time.
- 35
coin
/kɔɪn/A flat, round piece of metal used as money.
She dropped a coin into the fountain and made a wish.
- 36
commotion
/kəˈmoʊ.ʃən/A state of confused and noisy disturbance.
The sudden commotion in the hallway startled everyone.
- 37
conclude
/kənˈkluːd/To end something, or to decide after considering the facts.
The study concluded that exercise improves sleep.
- 38
concur
/kənˈkɜːr/To be of the same opinion; to agree.
The medical experts concur that early treatment improves outcomes.
- 39
consist
/kənˈsɪst/To be made up of particular parts or things.
The breakfast consists of eggs, toast, and fruit.
- 40
court
/kɔːrt/The place where legal cases are judged, or an area for playing sports.
The case will be heard in court next month.
- 41
cower
/ˈkaʊ.ər/To crouch down in fear.
The puppy cowered in the corner during the thunderstorm.
- 42
criminal
/ˈkrɪm.ɪ.nəl/A person who has committed a crime.
The criminal was sentenced to five years in prison.
- 43
cruel
/ˈkruː.əl/Willfully causing pain or suffering to others.
It is cruel to keep wild animals in small cages.
- 44
custom
/ˈkʌs.təm/A traditional way of behaving that is special to a group or place.
It is a local custom to remove your shoes indoors.
- 45
dagger
/ˈdæɡ.ər/A short knife with a pointed blade, used as a weapon.
The ancient dagger was found buried in the tomb.
- 46
daily
/ˈdeɪ.li/Happening or done every day.
She goes for a daily walk in the park.
- 47
deflect
/dɪˈflekt/To cause something to change direction; to turn aside.
The shield helped deflect the incoming projectiles.
- 48
diamond
/ˈdaɪ.mənd/A very hard, clear precious stone used in jewelry.
The ring was set with a sparkling diamond.
- 49
directly
/daɪˈɹɛk(t)li/In a direct manner; in a straight line or course.
He drove directly to the office, and didn't stop off at the petrol station.
- 50
dislike
/dɪˈslaɪk/To not like someone or something.
He dislikes loud parties and crowded places.
- 51
drab
/dræb/Lacking brightness or interest; drearily dull.
The office walls were painted a drab shade of grey.
- 52
drum
/drʌm/A percussion instrument sounded by being struck with sticks or hands.
He played the drum with a steady rhythm.
- 53
drunken
/ˈdrʌŋ.kən/Intoxicated from alcohol; relating to drinking.
His drunken behavior caused a scene at the restaurant.
- 54
eavesdrop
/ˈiːvz.drɒp/To secretly listen to a conversation.
She overheard the secret by accident, not meaning to eavesdrop.
- 55
effectively
/ɪˈfek.tɪv.li/In a way that produces the result you want.
The new medicine treats the infection effectively.
- 56
effort
/ˈef.ərt/Physical or mental energy used to do something.
Learning a language takes time and effort.
- 57
embankment
/ɪmˈbæŋk.mənt/A wall or bank of earth built to prevent flooding.
They walked along the river embankment at sunset.
- 58
embarrassed
/ɪmˈber.əst/Feeling shy, ashamed, or uncomfortable about something.
She was embarrassed when she forgot his name.
- 59
emotion
/ɪˈmoʊ.ʃən/A strong feeling such as love, anger, or fear.
His voice was full of emotion as he spoke.
- 60
enemy
/ˈen.ə.mi/A person who is actively opposed to someone or something.
Lack of sleep is the enemy of clear thinking.
- 61
entry
/ˈen.tri/The act of entering a place, or an item entered in a competition or list.
The sign on the gate said no entry.
- 62
environmental
/ɪnˌvaɪ.rənˈmen.təl/Relating to the natural world and the effect humans have on it.
Plastic waste causes serious environmental problems.
- 63
escape
/ɪˈskeɪp/To break free from confinement or control.
The prisoners planned to escape through a tunnel.
- 64
essential
/ɪˈsen.ʃəl/Absolutely necessary; extremely important.
Water is essential for all living organisms.
- 65
examine
/ɪɡˈzæmɪn/To observe or inspect carefully or critically
He examined the crime scene for clues.
- 66
except
/ɪkˈsept/Not including; apart from.
The museum is open every day except Monday.
- 67
expected
/ɪkˈspek.tɪd/Believed likely to happen or arrive.
The expected delivery date is next Tuesday.
- 68
explode
/ɪkˈsploʊd/To burst violently with a loud noise.
The fireworks exploded in bright colors over the harbor.
- 69
explore
/ɪkˈsplɔːr/To travel in or through an unfamiliar area to learn about it.
They decided to explore the ancient ruins on foot.
- 70
export
/ɪkˈspɔːrt/To send goods to another country to be sold.
The country exports coffee all over the world.
- 71
feature
/ˈfiː.tʃər/An important or noticeable part or quality of something.
The phone's best feature is its camera.
- 72
financial
/faɪˈnæn.ʃəl/Relating to money and how it is managed.
The company is in good financial health.
- 73
frequently
/ˈfriː.kwənt.li/Often; many times.
Trains run frequently between the two cities.
- 74
fuel
/ˈfjuː.əl/A substance such as petrol or coal that is burned to produce energy.
The plane stopped to take on more fuel.
- 75
futile
/ˈfjuː.taɪl/Incapable of producing any useful result; pointless.
All attempts to negotiate proved futile.
- 76
gather
/ˈɡæð.ər/To come together; to collect or assemble.
People gathered in the town square for the celebration.
- 77
gentle
/ˈdʒen.tl̩/Mild in temperament or behavior; kind and tender.
He spoke in a gentle voice to calm the frightened animal.
- 78
ghost
/ɡoʊst/The spirit of a dead person that some people believe can appear.
They say a ghost haunts the old castle.
- 79
go
/ɡoʊ/To move from one place to another; to travel.
We need to go to the store before it closes.
- 80
hate
/heɪt/To dislike someone or something very strongly.
I hate getting up early on cold mornings.
- 81
headline
/ˈhed.laɪn/The title of a newspaper story, printed in large letters.
The scandal made the front-page headline.
- 82
honest
/ˈɒn.ɪst/Free of deceit and untruthfulness; sincere.
She gave an honest answer to the difficult question.
- 83
hurry
/ˈhɜːr.i/To move or do something quickly because of limited time.
Hurry, or we'll miss the train!
- 84
ignore
/ɪɡˈnɔːr/To refuse to take notice of or acknowledge.
She decided to ignore the rude comment and walk away.
- 85
implicit
/ɪmˈplɪs.ɪt/Implied though not plainly expressed.
There was an implicit understanding between the two friends.
- 86
importance
/ɪmˈpɔːr.təns/The quality of being significant or valuable.
The teacher stressed the importance of regular practice.
- 87
indifferent
/ɪnˈdɪf.ər.ənt/Having no particular interest or sympathy; unconcerned.
He seemed indifferent to the outcome of the vote.
- 88
intelligence
/ɪnˈtel.ɪ.dʒəns/The ability to learn, understand, and think about things.
The puzzle is designed to test your intelligence.
- 89
invoice
/ˈɪn.vɔɪs/A list of goods sent or services provided with a statement of the sum due.
The contractor sent an invoice for the completed work.
- 90
jealous
/ˈdʒel.əs/Feeling resentment toward someone because of their advantages.
She was jealous of her sister's new bicycle.
- 91
juggler
/ˈdʒʌɡ.lər/A person who keeps several objects in the air at the same time.
The street juggler amazed the crowd with six flaming torches.
- 92
keen
/kiːn/Having a sharp edge or point; enthusiastic and eager.
He has a keen interest in marine biology.
- 93
leading
/ˈliː.dɪŋ/Most important or most successful; in first position.
She is a leading expert on climate change.
- 94
like
/laɪk/Having similar qualities; to find agreeable or enjoyable.
I like reading books before bed.
- 95
literature
/ˈlɪt.ər.ə.tʃər/Written works such as novels, poems, and plays valued as art.
He studied French literature at university.
- 96
lonely
/ˈloʊn.li/Sad because one has no friends or company.
The lonely child longed for a playmate.
- 97
loot
/luːt/Goods taken from an enemy in war or stolen in a robbery.
The thieves hid their loot in an abandoned warehouse.
- 98
magic
/ˈmædʒ.ɪk/The power to make impossible things happen, or tricks that entertain.
The wizard in the story used magic to disappear.
- 99
mall
/mɔːl/A large building with many shops inside.
We spent the afternoon shopping at the mall.
- 100
management
/ˈmæn.ɪdʒ.mənt/The control and organization of a business or activity.
Good time management helps you finish work earlier.
- 101
marriage
/ˈmer.ɪdʒ/The legal relationship between two people who are married.
Their marriage lasted over fifty years.
- 102
mental
/ˈmen.təl/Relating to the mind or thinking.
Exercise is good for both physical and mental health.
- 103
midriff
/ˈmɪd.rɪf/The front of the body between the chest and the waist.
The crop top exposed her midriff.
- 104
murder
/ˈmɜːr.dər/The crime of deliberately killing a person.
The detective spent months solving the murder.
- 105
mystery
/ˈmɪs.tər.i/Something that is difficult or impossible to understand or explain.
The disappearance of the artifact remains a mystery.
- 106
nail
/neɪl/A thin metal pin used to fix things together, or the hard cover on a fingertip.
He hammered a nail into the wall to hang the picture.
- 107
neither
/ˈniː.ðər/Not one and not the other of two people or things.
Neither of the answers is correct.
- 108
nib
/nɪb/The pointed end part of a pen that touches the writing surface.
The calligrapher carefully selected a new nib for his pen.
- 109
obvious
/ˈɒb.vi.əs/Easily perceived or understood; clear and self-evident.
It was obvious from her smile that she was happy with the result.
- 110
occur
/əˈkɜːr/To happen, especially without being planned.
The accident occurred just after midnight.
- 111
organized
/ˈɔːr.ɡən.aɪzd/Arranged in a planned, tidy way; good at planning.
She keeps her desk neat and organized.
- 112
outdoors
/ˌaʊtˈdɔːrz/Outside, not in a building.
The kids love playing outdoors in summer.
- 113
outright
/ˈaʊt.raɪt/Wholly and completely; directly and openly.
He rejected the proposal outright without discussion.
- 114
pass
/pæs/To go past something, or to succeed in an exam.
She studied hard and passed the exam easily.
- 115
percentage
/pərˈsen.tɪdʒ/An amount expressed as part of a hundred.
A large percentage of students walk to school.
- 116
persuade
/pərˈsweɪd/To cause someone to do something through reasoning or argument.
She persuaded her parents to let her study abroad.
- 117
photography
/fəˈtɑː.ɡrə.fi/The art or activity of taking photographs.
She took up photography as a hobby last year.
- 118
planning
/ˈplæn.ɪŋ/The process of deciding how to do something before doing it.
Careful planning made the event a success.
- 119
plot
/plɑːt/The series of events that make up a story, or a secret plan.
The plot of the novel has many surprising twists.
- 120
point
/pɔɪnt/A discrete division of something.
point at somebody/something ‘What's your name?’ he asked, pointing at the child with his pen.
- 121
poison
/ˈpɔɪz(ə)n/A substance that is harmful or lethal to a living organism.
We used a poison to kill the weeds.
- 122
prayer
/prer/Words spoken to a god, or the act of speaking them.
She said a quiet prayer before the journey.
- 123
pretend
/prɪˈtend/To speak or act so as to make it appear that something is the case.
The children liked to pretend they were astronauts.
- 124
princess
/ˈprɪn.ses/The daughter of a king or queen.
The princess appeared beside the king at the ceremony.
- 125
promote
/prəˈmoʊt/To encourage something, or to raise someone to a higher position.
The campaign aims to promote healthy eating.
- 126
proud
/praʊd/Feeling deep pleasure from one's own achievements.
She was proud of her daughter's graduation.
- 127
punish
/ˈpʌn.ɪʃ/To make someone suffer because they have done something wrong.
The school will punish students who cheat.
- 128
puny
/ˈpjuː.ni/Small and weak; undersized.
The puny seedling struggled to grow in the rocky soil.
- 129
queue
/kjuː/A line of people waiting for something.
There was a long queue outside the ticket office.
- 130
quote
/kwoʊt/To repeat the exact words someone said or wrote.
She quoted a line from her favorite poem.
- 131
racing
/ˈreɪ.sɪŋ/The sport of competing in races.
He follows horse racing every weekend.
- 132
rare
/rer/Not common; not happening or found very often.
This bird is so rare that few people have seen it.
- 133
rascal
/ˈrɑːs.kəl/A mischievous or cheeky person, especially a child.
The little rascal hid his sister's shoes under the bed.
- 134
regularly
/ˈreɡ.jə.lər.li/At fixed times, or often.
You should water the plants regularly.
- 135
relation
/rɪˈleɪ.ʃən/A connection between things, or a member of your family.
The report examines the relation between diet and health.
- 136
relaxed
/rɪˈlækst/Calm and free from worry or tension.
He felt relaxed after a week at the beach.
- 137
rent
/ɹɛnt/A payment made by a tenant at intervals in order to occupy a property.
Are you looking to buy or rent?
- 138
request
/rɪˈkwest/An act of politely asking for something.
The hotel granted our request for a late checkout.
- 139
require
/rɪˈkwaɪr/To need something, or to demand it officially.
This recipe requires only four ingredients.
- 140
retire
/rɪˈtaɪr/To stop working, usually because of age.
My father plans to retire at sixty-five.
- 141
revise
/rɪˈvaɪz/To study again for an exam, or to change and improve a text.
She stayed up late to revise for her history exam.
- 142
rigid
/ˈrɪdʒ.ɪd/Unable to bend or be forced out of shape; strict.
The rigid schedule left no room for spontaneity.
- 143
rise
/raɪz/To move from a lower position to a higher one.
The sun began to rise over the mountains.
- 144
romantic
/roʊˈmæn.tɪk/Relating to love, or showing feelings of love.
They had a romantic dinner by candlelight.
- 145
rope
/roʊp/Thick, strong cord made of twisted fibers.
The climbers tied the rope around the rock.
- 146
rugby
/ˈrʌɡ.bi/A team sport played with an oval ball that can be carried.
He broke his nose playing rugby at school.
- 147
ruthless
/ˈruːθ.ləs/Having no pity or compassion for others.
The ruthless dictator suppressed all opposition.
- 148
sand
/sænd/The very small grains found on beaches and in deserts.
The children built castles in the warm sand.
- 149
sapling
/ˈsæp.lɪŋ/A young tree.
They planted a sapling in the garden to mark the occasion.
- 150
scan
/skæn/To look at something quickly, or to copy it with a machine.
Please scan the document and email it to me.
- 151
sham
/ʃæm/A thing that is not what it is purported to be; a fraud.
The election turned out to be a complete sham.
- 152
shard
/ʃɑːrd/A piece of broken ceramic, glass, or metal.
Shards of the broken vase littered the floor.
- 153
shrivel
/ˈʃrɪv.l̩/To wrinkle and contract through loss of moisture.
The grapes shriveled in the sun and became raisins.
- 154
sight
/saɪt/The ability to see, or something that you see.
The sunset over the valley was a beautiful sight.
- 155
silent
/ˈsaɪ.lənt/Not making or accompanied by any sound.
The forest was completely silent after the snowfall.
- 156
smart
/smɑːrt/Having quick intelligence; causing a sharp stinging pain.
She was smart enough to solve the puzzle in minutes.
- 157
smoky
/ˈsmoʊ.ki/Filled with or smelling of smoke.
The air in the old pub was thick and smoky.
- 158
spool
/spuːl/A cylindrical device on which thread or film is wound.
She wound the thread neatly onto the spool.
- 159
staff
/stæf/The people who work for an organization.
The hotel staff were friendly and helpful.
- 160
stealth
/stelθ/Cautious and surreptitious action or movement.
The cat moved with stealth as it stalked the bird.
- 161
stirrup
/ˈstɪr.əp/A pair of loops attached to a horse's saddle for the rider's feet.
She placed her foot firmly in the stirrup before mounting.
- 162
stranger
/ˈstreɪn.dʒər/A person whom one does not know.
A stranger approached and asked for directions.
- 163
string
/strɪŋ/Thin cord used for tying things, or a series of things.
She tied the package with a piece of string.
- 164
successfully
/səkˈsɛsfəli/In a successful manner; with success; without failing.
He successfully climbed the mountain.
- 165
suit
/suːt/A set of outer clothes worn together; a legal proceeding.
He wore his best suit to the interview.
- 166
superficial
/ˌsuː.pərˈfɪʃ.əl/Existing or occurring at or on the surface; lacking depth.
The damage to the car was only superficial.
- 167
survive
/sərˈvaɪv/To continue to live after a dangerous event.
Only a few plants can survive in the desert.
- 168
swivel
/ˈswɪv.l̩/To turn around a point or axis.
The chair can swivel a full 360 degrees.
- 169
symptom
/ˈsɪmp.təm/A sign of an illness felt or noticed in the body.
A high fever is a common symptom of flu.
- 170
tail
/teɪl/The part at the back of an animal's body that can move.
The dog wagged its tail happily.
- 171
tandem
/ˈtæn.dəm/A group of two working together; one behind another.
The two departments worked in tandem on the project.
- 172
thrust
/θrʌst/To push suddenly or violently in a specified direction.
He thrust the door open and rushed inside.
- 173
tinker
/ˈtɪŋ.kər/To attempt to repair or improve something in a casual way.
She liked to tinker with old radios in her spare time.
- 174
transport
/ˈtræn.spɔːrt/The system or act of moving people or goods from place to place.
Public transport in the city is cheap and reliable.
- 175
trend
/trend/A general direction of change, or a current fashion.
There is a growing trend toward working from home.
- 176
udder
/ˈʌd.ər/The mammary gland of female cattle and other animals.
The farmer milked the cow by squeezing its udder.
- 177
underwear
/ˈʌn.dər.wer/Clothes worn next to the skin under other clothing.
He packed socks and underwear for the trip.
- 178
unlike
/ʌnˈlaɪk/Different from someone or something.
Unlike her brother, she loves spicy food.
- 179
unlikely
/ʌnˈlaɪ.kli/Not probable; not expected to happen.
It's unlikely to rain this afternoon.
- 180
valuable
/ˈvæl.jə.bəl/Worth a lot of money, or very useful.
The thieves stole several valuable paintings.
- 181
versatile
/ˈvɜːr.sə.taɪl/Able to adapt to many different functions or activities.
She is a versatile musician who plays five different instruments.
- 182
violent
/ˈvaɪə.lənt/Using force to hurt people, or very strong and damaging.
The film is too violent for young children.
- 183
volunteer
/ˌvɑː.lənˈtɪr/A person who works willingly without being paid.
She works as a volunteer at the animal shelter.
- 184
warn
/wɔːrn/To tell someone about a danger or problem that may happen.
The forecast warned drivers about icy roads.
- 185
warranty
/ˈwɒr.ən.ti/A written guarantee promising to repair or replace a product.
The laptop came with a two-year warranty.
- 186
whatever
/wɒtˈɛvə/Unexceptional or unimportant; blah.
Take whatever action is needed.
- 187
whether
/ˈweð.ər/Used to talk about a choice between possibilities.
I don't know whether to take the job or not.
- 188
whim
/wɪm/A sudden desire or change of mind.
On a whim, she booked a flight to Paris.
- 189
within
/wɪˈðɪn/Inside a place, area, or period of time.
You will receive an answer within three days.
- 190
wool
/wʊl/The soft hair of sheep used to make cloth and yarn.
This scarf is made of pure wool.
- 191
worst
/wɜːrst/The most bad; worse than all others.
That was the worst meal I've ever eaten.
- 192
wriggle
/ˈrɪɡ.l̩/To twist and turn with quick movements.
The child wriggled free from his mother's grasp.
How to use a list like this
Reading a word list start to finish is the least effective thing you can do with it. Vocabulary sticks when you meet a word in context, need it, and retrieve it later. A list is useful for two narrower jobs: finding the gaps, and checking whether the level you were assigned matches what you actually know.
A practical pass: scroll through, mark the words you could not define to a friend, and put only those into whatever review system you use. Twenty unknown words handled properly beat two hundred skimmed.
Where these levels come from
Each word here carries the level our own test assigns it, based on frequency banding rather than an official CEFR wordlist. The CEFR describes what you can do with a language, not which words you must know, so no authoritative per-word list exists. Treat the level as a useful sorting of frequency, not a ruling.
Background on the numbers: vocabulary size by CEFR level, how many English words the average person knows and the native speaker gap.
Turn the gaps into a review deck
English Vocabulary Size Test on Android tests you on the same words, keeps your history, and schedules the ones you missed for spaced repetition. Works offline, 16 interface languages.