# tumor vs tumour

> English confusable word pair

## The two words

### tumor
*noun · IPA /tjuː.mə/ · frequency rank #7,514*
An abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia.

### tumour
*noun · frequency rank #17,510*
Commonwealth standard spelling of tumor.

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