Check words you know to measure your vocabulary size (number of word families).
definite
read
drink
offer
earn
qualify
ruin
series
extent
reflect
apology
constrain
abrupt
cynical
sentiment
landlord
spider
dessert
ruthless
submarine
lobster
falter
pike
dove
horde
booze
apocalypse
savoury
evasion
annihilate
arduous
veneer
lapel
oar
circumcize
tote
totter
rottweiler
axial
stent
enjoin
tedium
baste
delirium
hotbed
depersonalize
squamous
gout
gaffer
papaya
fudging
tomboy
twill
tanner
micrograph
miasma
farrier
polycarbonate
cognoscenti
periscope
gallbladder
leucocyte
centrepiece
nar
glomerular
superscript
scrim
puffball
uric
dirigible
operandi
skive
mollycoddle
oxy
prang
zydeco
factitious
pleomorphic
firma
gimcrack
farsi
flextime
whereon
annelid
weigela
maguey
regnant
pileus
cardiogram
organo
phorid
icosahedral
fynbos
kino
coelom
gey
atheling
progastrin
corvee
ergative