# fission vs fusion

> English confusable word pair

## The two words

### fission
*noun · IPA /ˈfɪʃən/ · frequency rank #25,059*
The process whereby one item splits to become two.

### fusion
*noun · IPA /ˈfjuː.ʒən/ · frequency rank #6,911*
The act of merging separate things, or the result thereof.

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