# diagnosis vs diagnostic

> English confusable word pair

## The two words

### diagnosis
*noun · IPA /daɪəɡˈnəʊsɪs/ · frequency rank #5,121*
The process of, or an instance of, identification of the nature and cause of a medical condition or illness.

### diagnostic
*adjective · IPA /daɪ.əɡˈnɒs.tɪk/ · frequency rank #9,165*
Of, or relating to diagnosis.

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