# firm vs FIS

> English confusable word pair

## The two words

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

### FIS
*noun · frequency rank #40,245*
Initialism of flight information service.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-02.
Canonical page: https://plainspell.com/en/vs/firm-vs-fis