Check words you know to measure your vocabulary size (number of word families).
week
build
may
mountain
register
otherwise
guest
adapt
designate
explosion
expand
treaty
straw
weep
offset
swift
mistress
vacation
dairy
messenger
rave
subsist
huddle
cuff
gull
savoury
obsolete
obituary
poppy
blockbuster
thyme
ordinance
attrition
prologue
dissuade
booty
extravaganza
pseudonym
luscious
absolve
squalid
untoward
tithe
couture
wench
retrofit
veracity
gentrify
trenchant
vacuous
gorged
potable
klingon
newsagent
tracery
audiometer
deejay
polychlorinate
ejecta
vor
chanterelle
vitro
vegetal
panegyric
warlock
annales
ipsilateral
chamfer
sens
ree
oviduct
knick
mieux
guarani
lapwing
cesium
zonk
nauseam
wildcatter
prosopopoeia
temporomandibular
conation
gravid
maunder
voussoir
spaghettini
chromodynamics
tenebrous
hutong
crataegus
boletus
fluorspar
septate
gussie
churr
gey
dst
organophosphorous
donzel
corium