# ao vs arc

> English confusable word pair

## The two words

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

### arc
*noun · IPA /ɑːk/ · frequency rank #5,005*
That part of a circle which a heavenly body appears to pass through as it moves above and below the horizon.

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