# fen vs fo

> English confusable word pair

## The two words

### fen
*noun · IPA /fɛn/ · frequency rank #35,717*
A type of wetland fed by ground water and runoff, containing peat below the waterline, characteristically alkaline.

### 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/fen-vs-fo