Which to use
“ninety” is a num and “nitty” is an adjective - they look or sound alike but fill different roles in a sentence.
- #11,078
- “ninety” frequency rank
- #41,785
- “nitty” frequency rank
- 52863
- confusion score
Side-by-Side Comparison
| Feature | ninety | nitty |
|---|---|---|
| Definition | The cardinal number occurring after eighty-nine and before ninety-one, represented in Roman numerals as XC and in Arabic numerals as 90. | Full of nits. |
Where the eye mixes ninety and nitty
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. ninety runs 6 letters (CVCVCV) against nitty's 5 (CVCCV) - the length gap alone is often enough to separate them once you know to check it.
Visual trap between ninety and nitty
These two trip readers on the page rather than in the ear: ninety is /ˈnaɪn.ti/ while nitty is /ˈnɪtiː/. 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 (num vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 52863, derived from the frequency rank of both members and their visual similarity.
ninety is recorded at frequency rank #11,078, classified as anum, pronounced /ˈnaɪn.ti/. nitty is at rank #41,785, tagged as anadj, pronounced /ˈnɪtiː/.
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 52863, this pair ranks #153,580 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of ninety vs nitty
Shared letters: inty. Private to "ninety": e. Private to "nitty": -.
"ninety" · 6 letters · shape CVCVCV · "nitty" · 5 letters · shape CVCCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "ninety" for "nitty" ever safe?
In ordinary English text, does "ninety" or "nitty" show up more?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "ninety" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "nitty" - compare definitions side by side with the headword page. Word entry
- This pair ranks #153,580 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "ninety" and "nitty" also get mixed up with nearby pairs, the highest-scored neighbour is "natty vs nitty". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #153,580 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.