# FOSS vs FSA

> English confusable word pair

## The two words

### FOSS
*noun · IPA /fɒs/ · frequency rank #33,655*
Initialism of Free and Open Source Software.

### FSA
*noun · frequency rank #24,161*
Initialism of flexible spending account or flexible spending arrangement.

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