# IEP vs io

> English confusable word pair

## The two words

### IEP
*noun · frequency rank #45,987*
Initialism of isoelectric point.

### io
*noun · IPA /ˈaɪəʊ/ · frequency rank #16,946*
A type of moth, the io moth.

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