# FOSS

> English word · Noun · IPA /fɒs/ · frequency rank #33,655

## Definitions
1. Initialism of Free and Open Source Software.

## Easily confused with
- **FS** (https://plainspell.com/en/vs/foss-vs-fs)
- **fox** (https://plainspell.com/en/vs/foss-vs-fox)
- **FSA** (https://plainspell.com/en/vs/foss-vs-fsa)
- **FSB** (https://plainspell.com/en/vs/foss-vs-fsb)
- **foy** (https://plainspell.com/en/vs/foss-vs-foy)
- **fou** (https://plainspell.com/en/vs/foss-vs-fou)
- **four** (https://plainspell.com/en/vs/foss-vs-four)
- **foul** (https://plainspell.com/en/vs/foss-vs-foul)
- **fuse** (https://plainspell.com/en/vs/foss-vs-fuse)
- **fuss** (https://plainspell.com/en/vs/foss-vs-fuss)
- **fowl** (https://plainspell.com/en/vs/foss-vs-fowl)
- **foxy** (https://plainspell.com/en/vs/foss-vs-foxy)
- **furs** (https://plainspell.com/en/vs/foss-vs-furs)
- **Foxx** (https://plainspell.com/en/vs/foss-vs-foxx)
- **FTSE** (https://plainspell.com/en/vs/foss-vs-ftse)
- **frost** (https://plainspell.com/en/vs/foss-vs-frost)
- **fouls** (https://plainspell.com/en/vs/foss-vs-fouls)
- **fuses** (https://plainspell.com/en/vs/foss-vs-fuses)
- **fussy** (https://plainspell.com/en/vs/foss-vs-fussy)
- **fossa** (https://plainspell.com/en/vs/foss-vs-fossa)

## Common misspellings (4)
`ffoss`, `fos`, `fsos`, `ofss`

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