# ADR vs AR

> English confusable word pair

## The two words

### ADR
*noun · IPA /eɪ di ˈɑɹ/ · frequency rank #35,173*
Initialism of adverse drug reaction.

### 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/adr-vs-ar