# Aar vs AR

> English confusable word pair

## The two words

### Aar
*name · IPA /ɑɹ/ · frequency rank #45,768*
A river in Switzerland, flowing 292 km from the glaciers of the Bernese Alps into the Rhine at Koblenz, on the Swiss–German border.

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

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