# FIS vs FM

> English confusable word pair

## The two words

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

### FM
*noun · frequency rank #6,908*
Initialism of frequency modulation; radio programming that is broadcast in this form.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/fis-vs-fm