Which to use
“diagnostic” is an adjective and “diagnostics” is a noun - they look or sound alike but fill different roles in a sentence.
- #9,165
- “diagnostic” frequency rank
- #22,057
- “diagnostics” frequency rank
- 31222
- confusion score
Side-by-Side Comparison
| Feature | diagnostic | diagnostics |
|---|---|---|
| Definition | Of, or relating to diagnosis. | plural of diagnostic |
Where the spellings diverge
Shared letters are muted; the letters that actually set diagnostic and diagnostics apart are highlighted. They share 10 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: diagnostic is anadjective and diagnosticsanoun. On the page they differ by 1 extra letter(s) - “diagnostic” sits inside “diagnostics”. Our composite confusion score for this pair is 31222, derived from the frequency rank of both members and their visual similarity.
diagnostic is recorded at frequency rank #9,165, classified as anadj, pronounced /daɪ.əɡˈnɒs.tɪk/. diagnostics is at rank #22,057, tagged as anoun.
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 31222, this pair ranks #347,966 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of diagnostic vs diagnostics
Shared letters: acdginost. Private to "diagnostic": -. Private to "diagnostics": -.
"diagnostic" · 10 letters · shape CVVCCVCCVC · "diagnostics" · 11 letters · shape CVVCCVCCVCC
Known mistypes of this pair
- diagnostic ← daignostic · ddiagnostic · diaggnostic · diagnnostic · diagnositc · diagnosstic · diagnostci · diagnosticc
- diagnostics ← daignostics · ddiagnostics · diaggnostics · diagnnostics · diagnositcs · diagnosstics · diagnostcis · diagnosticcs
Frequency comparison
Frequently Asked Questions
Can "diagnostic" and "diagnostics" be used interchangeably?
Which is more common, "diagnostic" or "diagnostics"?
Remembering diagnostic vs diagnostics
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “diagnostic”; for a noun, it's “diagnostics”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “diagnostic” entry
- Browse more pairs most likely to be confused. Most confusable