# optimise vs optimize

> English confusable word pair

## The two words

### optimise
*verb · frequency rank #47,235*
Non-Oxford British English standard spelling of optimize.

### optimize
*verb · IPA /ˈɑptɪmaɪz/ · frequency rank #18,909*
To act optimistically or as an optimist.

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