# oo vs OS

> English confusable word pair

## The two words

### oo
*noun · frequency rank #13,572*
(Ω, ω) The Greek letter omega.

### OS
*name · IPA /ˌoʊ ˈɛs/ · frequency rank #6,077*
Initialism of Owen Sound.

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