# foam vs foo

> English confusable word pair

## The two words

### foam
*noun · IPA /foʊm/ · frequency rank #9,898*
A substance composed of a large collection of bubbles or their solidified remains, especially

### foo
*noun · IPA /fuː/ · frequency rank #18,562*
Alternative form of fu: an administrative subdivision of imperial China; the capital of such divisions.

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