# adder vs ADR

> English confusable word pair

## The two words

### adder
*noun · IPA /ˈædɚ/ · frequency rank #41,977*
Any snake.

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

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