# undo vs Unix

> English confusable word pair

## The two words

### undo
*verb · IPA /ʌnˈduː/ · frequency rank #13,631*
To reverse the effects of an action.

### Unix
*name · IPA /ˈjuː.nɪks/ · frequency rank #19,495*
An operating system that shares the original source code by Dennis Ritchie and Ken Thompson.

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