# macOS vs MCS

> English confusable word pair

## The two words

### macOS
*name · IPA /ˌmækoʊˈɛs/ · frequency rank #28,283*
A major operating system, formerly known as OS X (and before that as Mac OS X), used on laptop and desktop computers by Apple Inc.

### MCS
*noun · frequency rank #30,883*
Initialism of multiple chemical sensitivity.

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