# firm vs firth

> English confusable word pair

## The two words

### firm
*noun · IPA /fɜɹm/ · frequency rank #1,693*
A business partnership; the name under which it trades.

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

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