Check words you know to measure your vocabulary size (number of word families).
discover
sick
lovely
often
community
sheet
tin
firm
urban
gesture
legend
chart
arena
grief
rehearse
tangle
sweater
spiral
surveillance
vine
outweigh
purify
revel
bunker
tram
repent
repatriate
compassionate
strata
linoleum
tantrum
anew
coop
exponential
occult
inordinate
angst
sideboard
modal
colorectal
magenta
defrost
pullover
erudite
anaesthesia
forceps
luminescence
rota
quadratic
bashful
osmosis
switchback
callouses
nether
egotism
hoopla
corpuscle
hieroglyph
frump
cyclotron
dolt
milkweed
papist
anodyne
quango
foxtrot
tipster
iambic
laburnum
domini
parvenu
pullet
unguent
rabbiting
bloodstock
ragbag
straitlaced
slowpoke
autogyro
nugatory
chaque
palmette
agapanthus
parapharyngeal
sapphic
petrous
concertino
vervain
oilbird
mackinaw
gourde
pavlova
chazan
wilco
panier
targe
buskin
americium
marcasite
sars