Check words you know to measure your vocabulary size (number of word families).
wine
subject
bottom
still
melt
roar
recommend
bean
moreover
expenditure
retain
latter
warrant
span
jar
ink
papa
anomaly
worthwhile
reef
trump
intuition
dwindle
carpenter
concerto
exacted
hitherto
substantiate
rafter
jubilee
typify
grandeur
catechism
daft
indoctrinate
snuggle
shortcut
pap
altruistic
coriander
lopsided
maxilla
outhouse
hypothermia
chrysanthemum
garble
cuss
arboretum
manna
vasectomy
knell
synergistic
homeric
hopi
apprise
gumbo
mayfly
gravitas
panzer
lilliputian
desperado
honcho
agora
besmirch
foxtrot
astrolabe
boffin
judder
calculi
granulomatous
percipient
serine
teenybop
tunny
shiksa
marabou
abeam
villein
hyperlink
adrenergic
gnomon
valine
velociraptor
phantasmagora
exilic
minatory
doula
kinescope
morro
archaeoastronomy
trematode
imprimatura
rhizomatous
teleview
murrey
honan
holophrase
baldachin
cenozoic
neoteric