# choo vs cog

> English confusable word pair

## The two words

### choo
*noun · IPA /tʃuː/ · frequency rank #20,061*
The sound of a locomotive whistle.

### cog
*noun · IPA /kɒɡ/ · frequency rank #28,496*
A tooth on a gear.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/choo-vs-cog