# firth vs fourth

> English confusable word pair

## The two words

### firth
*noun · IPA /fɜːθ/ · frequency rank #22,972*
An arm or inlet of the sea; a river estuary.

### fourth
*adjective · IPA /fɔːθ/ · frequency rank #1,562*
The ordinal form of the number four.

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