What’s a “word family”?
A base word and all the forms built from it. If you know “read”, you very likely also know its family — so we count them together.
read
readsreadingreaderreadablereread
How it works
01
Read a sentence
We show you a real sentence with one word blanked out, drawn from a frequency-ranked list of English word families.
02
Choose the meaning
Pick the definition that matches the missing word from four options.
03
Get your estimate
Your accuracy across each 1,000-word frequency band is extrapolated into a total word family count.
Ready when you are
Words are sampled across ten frequency bands, from the most common 1,000 word families up to the 10,000th.
~12 min · 10 frequency bands
Begin the test →