🧠Cerebite

Vocabulary Size Test

Check every word whose meaning you know. Be honest — a few made-up words are hidden in the list to keep everyone truthful.

Your vocabulary is about
0
words

Tap a word to mark it as known. When you're done, press "See my result".

How the estimate works

The Spanish lexicon is sampled in frequency bands — from the 1,000 most common words down to extremely rare ones. You see a few random words from each band; the share you know in a band estimates how much of that whole band you know, and adding the bands up gives your total. Checking made-up words lowers the estimate, so honesty pays. Every retake draws a fresh random sample, so your number may vary by a couple of thousand — that's normal for a 2-minute estimate.

What makes Spanish vocabulary distinctive

Spanish has an unusually regular relationship between spelling and sound, which means a word you have only heard is usually a word you can also read and write. That regularity extends into word formation: suffixes attach predictably, so knowing a base word often gives you the noun, the adjective and the diminutive at no extra cost.

For English speakers there is a second effect, and it cuts both ways. A very large number of Spanish and English words share Latin ancestry, so words like elegante, familia and posible are free. But the same resemblance produces false friends — embarazada means pregnant, éxito means success, actualmente means currently — and self-report tests are inflated exactly by that kind of confident wrong guess.

How the estimate works

The Spanish lexicon is sampled in frequency bands, from the thousand most common words down to genuinely rare ones. You see a small random selection from each band; the share you know in a band estimates how much of that band you know overall, and the bands add up to a total. Nobody is shown every word, so the number is an estimate by construction.

Invented words are mixed in as a correction. They are built to follow Spanish spelling and stress patterns exactly, which makes them hard to dismiss on sound alone — and for a learner leaning on cognates, they are harder still. Checking one lowers your estimate, so honesty produces a more useful figure than optimism.

Using the result

Frequently asked questions

How accurate is this vocabulary test?
It's a statistical estimate from a 2-minute sample, not a full exam — expect a margin of a few thousand words. Taking it several times and averaging gives a steadier number. Research puts adult native speakers at roughly 20,000–35,000 words, which matches what this method reports.
Why are there made-up words in the list?
They're an honesty check. Self-reported tests are easy to inflate by checking everything — but fake words catch that, and each one you check lowers your estimate. If you avoid them all, your result is trustworthy.
What counts as "knowing" a word?
Check it if you could give at least one meaning of the word when you see it. You don't need to spell it from memory or use it actively — recognizing the meaning is the standard used by vocabulary researchers.
How many Spanish words do I need to hold a conversation?
Frequency research is encouraging: the 1,000 most common Spanish words cover the large majority of everyday speech, and around 2,000–3,000 lets you handle most daily conversations comfortably. Reading newspapers and novels without a dictionary takes considerably more — which is what the higher bands of this test measure.
Is Spanish vocabulary easy to learn for English speakers?
Easier than most languages: both draw heavily on Latin, giving thousands of near-identical cognates like familia, importante and universidad. Watch out for false friends, though — embarazada means pregnant, not embarrassed, and éxito means success, not exit. Cognates give you a head start; steady study does the rest.
How many new Spanish words should I learn per day?
Most learners sustain 5–15 new words a day without burning out; consistency matters far more than big bursts. Prioritize high-frequency words first — they appear constantly, so daily life keeps reviewing them for you — and retake this test monthly to see the habit translate into a bigger estimate.