Check words you know to measure your vocabulary size (number of word families).
radio
light
arrive
least
disease
idiot
kilometre
scale
transform
secretary
interpret
consent
verse
dwell
mammal
enrich
discern
battalion
pesticide
groom
devalue
memorandum
stranded
contraction
gastrointestinal
footage
indebted
peck
fir
laborious
opium
serpent
collegiate
paramedic
kilowatt
dismount
respiration
sinew
musty
bayonet
palliative
incredulity
premeditate
crochet
leprosy
debauch
jacuzzi
acclimatise
butch
putrid
demagogue
prefigure
ukelele
whopper
defoliate
sociopath
troika
zephyr
vulgaris
neoprene
cheroot
munificent
odeon
conga
espadrille
gimp
nystagmus
bilk
staph
atopic
retrogress
sociometric
hireling
photosensitive
epee
merseysider
estoppal
mezzotint
breccia
billabong
polycystic
cineplex
agon
apraxia
supermom
kokanee
descale
garni
doggo
librium
serotonergic
planform
bicarb
haslet
hemoptysis
bombesin
kalpa
ancillae
argentum
versant