# psi vs PTA

> English confusable word pair

## The two words

### psi
*noun · IPA /psaɪ/ · frequency rank #16,099*
The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.

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

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