# con vs cos

> English confusable word pair

## The two words

### con
*verb · IPA /kɒn/ · frequency rank #4,434*
To study or examine carefully, especially in order to gain knowledge of; to learn, or learn by heart.

### 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/con-vs-cos