# cortex vs cotter

> English confusable word pair

## The two words

### cortex
*noun · IPA /ˈkɔɹtɛks/ · frequency rank #13,126*
The outer layer of an internal organ or body structure, such as the kidney or the brain.

### cotter
*noun · IPA /kɒtə/ · frequency rank #37,401*
A pin or wedge inserted through a slot to hold machine parts together.

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