Which to use
“oni” and “oo” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #36,267
- “oni” frequency rank
- #13,572
- “oo” frequency rank
- 49839
- confusion score
Side-by-Side Comparison
| Feature | oni | oo |
|---|---|---|
| Definition | A Japanese evil spirit or demon. | (Ω, ω) The Greek letter omega. |
Letter map: oni vs oo
Shared letters muted; letters that set oni and oo apart highlighted. Shared run: 1.
Pair insight - oni / oo
oni and oo are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 49839, derived from the frequency rank of both members and their visual similarity.
oni is recorded at frequency rank #36,267, classified as anoun, pronounced /ˈəʊni/. oo is at rank #13,572, 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 49839, this pair ranks #179,810 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of oni vs oo
Shared letters: o. Private to "oni": in. Private to "oo": -.
"oni" · 3 letters · shape VCV · "oo" · 2 letters · shape VV
Frequently Asked Questions
Is swapping "oni" for "oo" ever safe?
In ordinary English text, does "oni" or "oo" show up more?
After this comparison
Pair "oni" vs "oo" is on the table, pick a follow-up below.
- Full dictionary entry for "oni" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "oo" - compare definitions side by side with the headword page. Word entry
- This pair ranks #179,810 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "oni" and "oo" also get mixed up with nearby pairs, the highest-scored neighbour is "omi vs oni". Nearby pair
Confusion rank #179,810 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.