Check words you know to measure your vocabulary size (number of word families).
grass
art
now
indeed
nut
gate
suck
shift
delegate
treasure
pave
religious
wreck
diagnosis
bundle
navigate
wrinkle
niche
asylum
charitable
informative
queue
blot
chronology
subconscious
sect
unwitting
undercover
flimsy
cello
brawl
dreary
phobia
considerate
pulsate
twain
atrophy
deprave
chafe
swindle
diffident
pediatric
obsolescence
brocade
straitjacket
accoutrement
culvert
hypertrophy
disconsolate
seance
cirrocumulus
reforested
ersatz
gliadin
bismuth
foetal
compositors
baluster
dimorphism
periscope
gastropod
lepton
klaxon
polyglot
egomania
adagio
spliff
burro
histocompatibility
bumptious
wasabi
dor
pil
colone
fluoridate
physiography
macroeconomist
hottie
gasohol
viceroyalty
rheology
peritonsillar
switchgrass
imipramine
faff
mastoiditis
maleficent
periphrasis
catena
miry
esparto
mettlesome
manciple
cuboidal
hinky
halliard
marcasite
barbital
chrysalid
helvetica