# prep vs PSP

> English confusable word pair

## The two words

### prep
*noun · IPA /pɹɛp/ · frequency rank #7,833*
Preparation.

### PSP
*noun · frequency rank #21,627*
Initialism of phenolsulfonphthalein.

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