# codec vs codex

> English confusable word pair

## The two words

### codec
*noun · frequency rank #43,084*
A device or program capable of performing transformations on a data stream or signal.

### codex
*noun · IPA /ˈkəʊdɛks/ · frequency rank #22,932*
An early manuscript book.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/codec-vs-codex