Check words you know to measure your vocabulary size (number of word families).
almost
bill
choose
more
reckon
licence
battery
proud
blend
bacterium
spill
subsequent
lap
debut
venue
indigenous
override
paradise
rag
rake
afflict
fret
tart
ibid
platelet
dominion
basque
funnel
heather
intractable
malpractice
beau
smog
malfunction
enthuse
lubricate
canary
siphon
lair
genteel
lather
diabolical
azure
snappy
ethylene
countervailing
crocus
ovum
epidermal
oestrogen
zing
befuddle
turnkey
centipede
fulsome
posy
vulgaris
baht
piste
flummox
rigmarole
perdition
persimmon
methylene
manova
mesenchymal
jackhammer
enders
octavo
irruption
lyse
damson
impiety
dulcet
bowdlerise
whiffle
terpene
maladroit
wetback
deodourize
nystatin
arcuate
cloisonne
thaler
areola
grapey
worrywart
eponym
cocotte
luteum
campanology
vouvray
tarboosh
hypercholesterolemia
bric
burgomaster
hexapeptide
gonfalon
galluses
cedarn