Which to use
“oni” and “onion” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #36,267
- “oni” frequency rank
- #8,464
- “onion” frequency rank
- 44731
- confusion score
Side-by-Side Comparison
| Feature | oni | onion |
|---|---|---|
| Definition | A Japanese evil spirit or demon. | A monocotyledonous plant (Allium cepa), allied to garlic, used as vegetable and spice. |
Where the eye mixes oni and onion
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Why the eye confuses oni with onion
A purely visual mix-up. oni (/ˈəʊni/) and onion (/ˈʌn.jən/) 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 2 extra letter(s) - “oni” sits inside “onion”. Our composite confusion score for this pair is 44731, 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/. onion is at rank #8,464, tagged as anoun, pronounced /ˈʌn.jən/.
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 44731, this pair ranks #227,890 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of oni vs onion
Shared letters: ino. Private to "oni": -. Private to "onion": -.
"oni" · 3 letters · shape VCV · "onion" · 5 letters · shape VCVVC
Known mistypes of this pair
- onion ← noion · oinon · onino · onionn · onnion · onoin
Frequently Asked Questions
Do "oni" and "onion" mean the same thing in a sentence?
Frequency check: "oni" vs "onion" - which ranks higher?
Useful next steps
Eye-level mix-up between "oni" and "onion" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "oni" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "onion" - compare definitions side by side with the headword page. Word entry
- This pair ranks #227,890 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "oni" and "onion" 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 #227,890 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.