# oo

> English word · Noun · frequency rank #13,572

## Definitions
1. (Ω, ω) The Greek letter omega.

## Etymology
Representation of a long-o sound.

## Easily confused with
- **or** (https://plainspell.com/en/vs/oo-vs-or)
- **op** (https://plainspell.com/en/vs/oo-vs-op)
- **OS** (https://plainspell.com/en/vs/oo-vs-os)
- **oz** (https://plainspell.com/en/vs/oo-vs-oz)
- **OT** (https://plainspell.com/en/vs/oo-vs-ot)
- **ou** (https://plainspell.com/en/vs/oo-vs-ou)
- **ow** (https://plainspell.com/en/vs/oo-vs-ow)
- **ox** (https://plainspell.com/en/vs/oo-vs-ox)
- **oy** (https://plainspell.com/en/vs/oo-vs-oy)
- **ov** (https://plainspell.com/en/vs/oo-vs-ov)
- **out** (https://plainspell.com/en/vs/oo-vs-out)
- **our** (https://plainspell.com/en/vs/oo-vs-our)
- **own** (https://plainspell.com/en/vs/oo-vs-own)
- **owe** (https://plainspell.com/en/vs/oo-vs-owe)
- **ore** (https://plainspell.com/en/vs/oo-vs-ore)
- **opt** (https://plainspell.com/en/vs/oo-vs-opt)
- **owl** (https://plainspell.com/en/vs/oo-vs-owl)
- **ops** (https://plainspell.com/en/vs/oo-vs-ops)
- **ooh** (https://plainspell.com/en/vs/oo-vs-ooh)
- **org** (https://plainspell.com/en/vs/oo-vs-org)

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