# ex vs X

> English confusable word pair

## The two words

### ex
*noun · IPA /ɛks/ · frequency rank #1,633*
The name of the Latin script letter X/x.

### X
*num · IPA /ɛks/ · frequency rank #647*
An unknown quantity or unknown value.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/vs/ex-vs-x