Which to use
“oni” and “onus” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #36,267
- “oni” frequency rank
- #29,402
- “onus” frequency rank
- 65669
- confusion score
Side-by-Side Comparison
| Feature | oni | onus |
|---|---|---|
| Definition | A Japanese evil spirit or demon. | A legal obligation. |
Where the eye mixes oni and onus
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. oni runs 3 letters (VCV) against onus's 4 (VCVC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses oni with onus
A purely visual mix-up. oni (/ˈəʊni/) and onus (/ˈəʊnəs/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 65669, 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/. onus is at rank #29,402, tagged as anoun, pronounced /ˈəʊnəs/.
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 65669, this pair ranks #71,623 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of oni vs onus
Shared letters: no. Private to "oni": i. Private to "onus": su.
"oni" · 3 letters · shape VCV · "onus" · 4 letters · shape VCVC
Known mistypes of this pair
- onus ← onnus · onsu · onuss · ouns
Frequently Asked Questions
Do "oni" and "onus" mean the same thing in a sentence?
In ordinary English text, does "oni" or "onus" 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 "oni" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "onus" - compare definitions side by side with the headword page. Word entry
- This pair ranks #71,623 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "oni" and "onus" also get mixed up with nearby pairs, the highest-scored neighbour is "omi vs oni". 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 #71,623 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.