# expansion vs extension

> English confusable word pair

## The two words

### expansion
*noun · IPA /ɪkˈspænʃən/ · frequency rank #2,791*
An act, process, or instance of expanding.

### extension
*noun · IPA /ɪkˈstɛnʃən/ · frequency rank #3,231*
The act of extending; a stretching out; enlargement in length, breadth, or time; an increase.

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