oni vs onus, What's the Difference?

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 spellings diverge

Shared letters are muted; the letters that actually set oni and onus apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

3 ch

oni

4 ch

onus

Spelling & Dictionary Insight

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

Frequency comparison

oni#36,267

onus#29,402

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "oni" and "onus" be used interchangeably?

No. They are said differently (/ˈəʊni/ versus /ˈəʊnəs/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Which is more common, "oni" or "onus"?

"onus" is the more common of the two: it sits at frequency rank #29,402 in our English list, against #36,267 for "oni". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering oni vs onus

The fastest way to pick the right one every time.

Read both glosses above and match the meaning you intend, only context separates this pair.
See each word in full, definition, IPA, etymology and its other confusables. Full “oni” entry
Browse more pairs most likely to be confused. Most confusable