Check words you know to measure your vocabulary size (number of word families).
prepare
radio
continue
summer
casual
nail
guarantee
bump
relatives
philosophy
nod
mutual
strap
elementary
commentator
jerk
ratify
inhale
quarrel
susceptible
outing
plank
riddle
pebble
ecclesiastic
overlay
tempo
hospice
allusion
hospitable
kernel
vacate
settee
orthopaedic
reprisal
granulate
ambulate
sultry
viper
tome
vous
hyena
diction
oeuvre
expeditious
sanctum
obtuse
folic
pyrotechnic
chloroform
refectory
ultrasonograph
alkyd
yore
plaudit
arpeggio
skylark
jiffy
cruciate
citrate
glug
bollard
needlepoint
streptokinase
scaremonger
allocative
scape
duopoly
fortissimo
erythromycin
capella
boule
dulcet
lederhosen
lait
osier
tropism
magmatic
doa
cotoneaster
chrism
morphia
termagant
concertacion
tonneau
gymslip
pedicab
poult
quatrefoil
microcellular
raphe
argy
sorn
rhinovirus
tournedos
anaclitic
gillyflower
dentifrice
ant
atheling