Which to use
“obs” and “onus” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #34,614
- “obs” frequency rank
- #29,402
- “onus” frequency rank
- 64016
- confusion score
Side-by-Side Comparison
| Feature | obs | onus |
|---|---|---|
| Definition | Police observation. | A legal obligation. |
Letter map: obs vs onus
Shared letters muted; letters that set obs and onus apart highlighted. Shared run: 2. obs runs 3 letters (VCC) against onus's 4 (VCVC) - the length gap alone is often enough to separate them once you know to check it.
Pair insight - obs / onus
obs and onus 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 64016, derived from the frequency rank of both members and their visual similarity.
obs is recorded at frequency rank #34,614, classified as anoun. 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 64016, this pair ranks #79,898 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of obs vs onus
Shared letters: os. Private to "obs": b. Private to "onus": nu.
"obs" · 3 letters · shape VCC · "onus" · 4 letters · shape VCVC
Known mistypes of this pair
- onus ← onnus · onsu · onuss · ouns
Frequently Asked Questions
Can "obs" and "onus" be used interchangeably?
Which is more common, "obs" or "onus"?
Useful next steps
You've compared "obs" and "onus". Here's where to go from here.
- Full dictionary entry for "obs" 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 #79,898 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "obs" and "onus" also get mixed up with nearby pairs, the highest-scored neighbour is "obs vs omi". 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 #79,898 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.