Check words you know to measure your vocabulary size (number of word families).
ask
ball
question
explain
canoe
sauce
spirit
dump
trigger
complex
electronic
journalist
wreck
classification
vendor
endeavour
vacuum
renovate
elicit
autobiography
garnish
brassiere
jelly
jersey
inventive
calibrate
thrift
plaza
hydrocarbon
autopsy
delve
snare
drowsy
whirlwind
wholehearted
mystique
joist
cognac
extrinsic
habitation
predilection
bifurcate
vanquish
tithe
ligand
cranial
warder
occlusion
shod
phlegm
palaeozoic
hydrant
limpid
tonsillectomy
amicus
pilaster
consumptive
diem
glycogen
hussar
cabriolet
adenoma
goulash
typo
extensional
judder
gastronomy
spliff
rumen
biloba
daiquiri
glute
komodo
evapotranspiration
zemstvo
tribology
cannulation
deodorize
caiman
pertinacious
prelapsarian
commensal
plumbago
grav
couchette
lief
oliguria
nellist
tonus
foliose
puisne
kylix
cistus
rosing
scrapple
aneurin
airth
emption
exosphere
dithyramb