# flatten vs flatter

> English confusable word pair

## The two words

### flatten
*verb · IPA /ˈflæ.tən/ · frequency rank #29,657*
To make something flat or flatter.

### flatter
*adjective · IPA /ˈflætɚ/ · frequency rank #20,359*
comparative form of flat: more flat

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