# arf vs AU

> English confusable word pair

## The two words

### arf
*intj · frequency rank #41,000*
Synonym of woof (“sound of a dog's bark”).

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

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