# A3 vs AR

> English confusable word pair

## The two words

### A3
*noun · frequency rank #19,748*
A one-page document, often tabular or graphical, on such paper.

### AR
*adjective · frequency rank #6,436*
Initialism of autoregressive.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/a3-vs-ar