# poo vs PSA

> English confusable word pair

## The two words

### poo
*noun · IPA /puː/ · frequency rank #14,190*
Alternative spelling of pooh: an instance of saying "poo".

### PSA
*noun · frequency rank #15,483*
Initialism of polysialic acid.

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