# rigor vs rigour

> English confusable word pair

## The two words

### rigor
*noun · IPA /ˈɹɪɡɚ/ · frequency rank #26,577*
US spelling of rigour.

### rigour
*noun · IPA /ˈɹɪɡə(ɹ)/ · frequency rank #43,349*
Severity or strictness.

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