# firth

> English word · Noun · IPA /fɜːθ/ · frequency rank #22,972

## Definitions
1. An arm or inlet of the sea; a river estuary.

## Etymology
Borrowed from Scots firth, furth, from Northern Middle English fyrth, from either or both of Old English ford and Old Norse fjǫrðr (“firth, fjord”), from Proto-Germanic *ferþu, *ferþuz (“inlet, fjord”), from Proto-Indo-European *pértus (“crossing”), from *per- (“to carry forth”) + *-tus (suffix forming action nouns from verb roots). The English word is a doublet of fjord, ford, port, and fjard.

## Easily confused with
- **fit** (https://plainspell.com/en/vs/firth-vs-fit)
- **fish** (https://plainspell.com/en/vs/firth-vs-fish)
- **fort** (https://plainspell.com/en/vs/firth-vs-fort)
- **fits** (https://plainspell.com/en/vs/firth-vs-fits)
- **fist** (https://plainspell.com/en/vs/firth-vs-fist)
- **forth** (https://plainspell.com/en/vs/firth-vs-forth)
- **forty** (https://plainspell.com/en/vs/firth-vs-forty)
- **flirt** (https://plainspell.com/en/vs/firth-vs-flirt)
- **fists** (https://plainspell.com/en/vs/firth-vs-fists)
- **fitch** (https://plainspell.com/en/vs/firth-vs-fitch)
- **forte** (https://plainspell.com/en/vs/firth-vs-forte)
- **froth** (https://plainspell.com/en/vs/firth-vs-froth)
- **frith** (https://plainspell.com/en/vs/firth-vs-frith)
- **fourth** (https://plainspell.com/en/vs/firth-vs-fourth)
- **flirty** (https://plainspell.com/en/vs/firth-vs-flirty)
- **fir** (https://plainspell.com/en/vs/fir-vs-firth)
- **fire** (https://plainspell.com/en/vs/fire-vs-firth)
- **firm** (https://plainspell.com/en/vs/firm-vs-firth)
- **fiat** (https://plainspell.com/en/vs/fiat-vs-firth)
- **fart** (https://plainspell.com/en/vs/fart-vs-firth)

## Common misspellings (7)
`ffirth`, `firht`, `firrth`, `firthh`, `firtth`, `fitrh`, `ifrth`

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