Which to use
“nifty” is an adjective and “ninety” is a num - they look or sound alike but fill different roles in a sentence.
- #23,344
- “nifty” frequency rank
- #11,078
- “ninety” frequency rank
- 34422
- confusion score
Side-by-Side Comparison
| Feature | nifty | ninety |
|---|---|---|
| Definition | Good, smart; useful or beneficial, often in an impressively clever way. | The cardinal number occurring after eighty-nine and before ninety-one, represented in Roman numerals as XC and in Arabic numerals as 90. |
Where the eye mixes nifty and ninety
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Why the eye confuses nifty with ninety
These two trip readers on the page rather than in the ear: nifty is /ˈnɪfti/ while ninety is /ˈnaɪn.ti/. 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 (adjective vs num), which is usually the fastest check. Our composite confusion score for this pair is 34422, derived from the frequency rank of both members and their visual similarity.
nifty is recorded at frequency rank #23,344, classified as anadj, pronounced /ˈnɪfti/. ninety is at rank #11,078, tagged as anum, pronounced /ˈnaɪn.ti/.
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 34422, this pair ranks #320,918 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of nifty vs ninety
Shared letters: inty. Private to "nifty": f. Private to "ninety": e.
"nifty" · 5 letters · shape CVCCV · "ninety" · 6 letters · shape CVCVCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "nifty" for "ninety" ever safe?
Which is more common, "nifty" or "ninety"?
What to do next
Eye-level mix-up between "nifty" and "ninety" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "nifty" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ninety" - compare definitions side by side with the headword page. Word entry
- This pair ranks #320,918 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "nifty" and "ninety" also get mixed up with nearby pairs, the highest-scored neighbour is "nifty 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 #320,918 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.