# AD vs AU

> English confusable word pair

## The two words

### AD
*adverb · IPA /ˌeɪˈdi/ · frequency rank #1,779*
Initialism of Anno Domini (borrowed from Latin); in the year of our Lord.

### 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/ad-vs-au