# an vs ao

> English confusable word pair

## The two words

### an
*article · IPA /ˈæn/ · frequency rank #30*
Form of a (all article senses).

### ao
*noun · frequency rank #17,538*
grue ("blue or green", considered one color)

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