# filth vs firth

> English confusable word pair

## The two words

### filth
*noun · IPA /fɪlθ/ · frequency rank #16,914*
Dirt; foul matter; that which soils or defiles.

### 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: 2026-05-06.
Canonical page: https://plainspell.com/en/vs/filth-vs-firth