# FES vs fo

> English confusable word pair

## The two words

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

### fo
*noun · frequency rank #12,049*
Abbreviation of folio, page and book size (10"-12.5" x 15"-20").

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