# FES vs flex

> English confusable word pair

## The two words

### FES
*noun · frequency rank #39,812*
Initialism of floppy eyelid syndrome

### flex
*noun · IPA /flɛks/ · frequency rank #10,696*
Flexibility, pliancy.

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