[Consultant32452]

Vocabulary is a component of IQ.

https://en.wikipedia.org/wiki/Intelligence_quotient

>The many different kinds of IQ tests include a wide variety of item content. Some test items are visual, while many are verbal. Test items vary from being based on abstract-reasoning problems to concentrating on arithmetic, vocabulary, or general knowledge.

[wfo]

That's odd, when I learned about it a long time ago I was told it was intended to measure "inherent" intelligence, not the level of exposure/memorization of a massive set of (likely trivial) data points.

Vocabulary very clearly belongs on an achievement test, not an aptitude test (as I imagined IQ to be).