# PSA vs PTA

> English confusable word pair

## The two words

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

### PTA
*noun · frequency rank #27,608*
Initialism of parent-teacher association.

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