# ACL vs AU

> English confusable word pair

## The two words

### ACL
*noun · frequency rank #17,750*
Initialism of anterior cruciate ligament.

### AU
*noun · frequency rank #6,867*
Initialism of alopecia universalis.

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