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
See a word
We show you one word, drawn from a frequency-ranked list of English word families — no sentence, no context clues.
02
Choose the meaning
Pick the definition that matches the word from four options.
03
Get your estimate
The test adapts as you answer, climbing toward rarer words when you're doing well, to find your level and extrapolate a total word family count.
Ready when you are
The test adapts as you go — climbing toward rarer word families up to the 25,000th when you’re doing well, and backing off when you’re not — to find your level in far fewer questions than testing every band.
~5 min · adapts across 25 frequency bands
Begin the test →