# optimal vs optimum

> English confusable word pair

## The two words

### optimal
*adjective · IPA /ˈɒptɪməl/ · frequency rank #7,824*
The best, most favourable or desirable, especially under some restriction.

### optimum
*noun · IPA /ˈɑptɪməm/ · frequency rank #14,178*
The best or most favorable condition, or the greatest amount or degree possible under specific sets of comparable circumstances.

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