Check words you know to measure your vocabulary size (number of word families).
support
because
obvious
it
technology
scream
cream
complain
facility
bureau
decade
scholar
garlic
commentator
chef
rib
optimism
prophet
ambiguity
covenant
denomination
pavilion
twofold
nitrate
enamel
ecclesiastic
precinct
libel
jot
posterior
cubism
misgiving
brine
cleft
skewer
prospecting
jackpot
consort
duplex
impassioned
foundationalism
pimple
matinee
comme
landfall
snigger
scion
inviolable
liaise
patois
disequilibrium
pituitary
yowl
simplex
agglomerate
tamp
extemporize
paralympic
biophysical
golem
chiaroscuro
chine
volumetric
screener
listserv
bunion
sui
pterodactyl
jackknife
seronegative
lactase
napa
gad
coracle
boondoggle
fricative
scatty
biomedicine
polypoid
haematoma
sarsaparilla
multisensory
chargehand
bacteremia
shutterbug
pyrophosphate
bricoleur
parol
hypoplasia
fasce
notturno
camelia
midas
diploidy
pharmacognosy
cyprinid
maline
cachou
cayuse
actinian