Check words you know to measure your vocabulary size (number of word families).
although
store
read
square
channel
survive
flow
strength
coincide
clause
cluster
contradict
abundant
prey
slam
horn
martyr
vacant
blunt
jockey
mentor
fleeting
twilight
abide
franc
fraternity
averse
vie
sumptuous
sludge
cant
spout
wavy
globule
slalom
postoperative
shanty
exonerate
provost
fondle
revitalise
rearm
pathogenic
vouch
prise
pliable
grizzle
chlorofluorocarbon
morrow
neuroscience
potable
overgrazed
tupperware
ergo
rollicking
bismuth
microstructure
metafiction
toute
nox
quarto
gibbet
fibula
contusion
curettage
dipstick
pentathlon
fauve
plasm
tonsure
shebang
gourmand
eustachian
filaria
wherry
spiv
leishmania
amphibole
oast
rhabdomyosarcoma
granita
carabiner
pompon
susu
ondansetron
duddy
monoglot
flibbertigibbet
mensuration
europium
pipistrelle
keef
agro
neuk
volvulus
quartern
mansuetude
reale
bagnio
likud