Which to use
“diagnosis” is a noun and “diagnostic” is an adjective - they look or sound alike but fill different roles in a sentence.
- #5,121
- “diagnosis” frequency rank
- #9,165
- “diagnostic” frequency rank
- 14286
- confusion score
Side-by-Side Comparison
| Feature | diagnosis | diagnostic |
|---|---|---|
| Definition | The process of, or an instance of, identification of the nature and cause of a medical condition or illness. | Of, or relating to diagnosis. |
Where the spellings diverge
Shared letters are muted; the letters that actually set diagnosis and diagnostic apart are highlighted. They share 8 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: diagnosis is /daɪəɡˈnəʊsɪs/ while diagnostic is /daɪ.əɡˈnɒs.tɪk/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 14286, derived from the frequency rank of both members and their visual similarity.
diagnosis is recorded at frequency rank #5,121, classified as anoun, pronounced /daɪəɡˈnəʊsɪs/. diagnostic is at rank #9,165, tagged as anadj, pronounced /daɪ.əɡˈnɒs.tɪk/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 14286, this pair ranks #470,955 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of diagnosis vs diagnostic
Shared letters: adginos. Private to "diagnosis": -. Private to "diagnostic": ct.
"diagnosis" · 9 letters · shape CVVCCVCVC · "diagnostic" · 10 letters · shape CVVCCVCCVC
Known mistypes of this pair
- diagnosis ← daignosis · ddiagnosis · diaggnosis · diagnnosis · diagnoiss · diagnosiss · diagnossi · diagnossis
- diagnostic ← daignostic · ddiagnostic · diaggnostic · diagnnostic · diagnositc · diagnosstic · diagnostci · diagnosticc
Frequency comparison
Frequently Asked Questions
Can "diagnosis" and "diagnostic" be used interchangeably?
Which is more common, "diagnosis" or "diagnostic"?
Remembering diagnosis vs diagnostic
The fastest way to pick the right one every time.
- Check the role first: if you need a noun, it's “diagnosis”; for an adjective, it's “diagnostic”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “diagnosis” entry
- Browse more pairs most likely to be confused. Most confusable