# CNS vs cos

> English confusable word pair

## The two words

### CNS
*noun · frequency rank #27,774*
Initialism of central nervous system.

### cos
*noun · IPA /kɑs/ · frequency rank #6,553*
Synonym of romaine lettuce, a long-leaved variety of lettuce.

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