# cog vs CU

> English confusable word pair

## The two words

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

### CU
*noun · frequency rank #13,895*
Initialism of control unit.

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