Which to use
“only” is an adjective and “onus” is a noun - they look or sound alike but fill different roles in a sentence.
- #79
- “only” frequency rank
- #29,402
- “onus” frequency rank
- 29481
- confusion score
Side-by-Side Comparison
| Feature | only | onus |
|---|---|---|
| Definition | Alone in a category. | A legal obligation. |
Where the eye mixes only and onus
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses only with onus
These two trip readers on the page rather than in the ear: only is /ˈəʊn.li/ while onus is /ˈəʊnəs/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 29481, derived from the frequency rank of both members and their visual similarity.
only is recorded at frequency rank #79, classified as anadj, pronounced /ˈəʊn.li/. 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 29481, this pair ranks #362,626 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of only vs onus
Shared letters: no. Private to "only": ly. Private to "onus": su.
"only" · 4 letters · shape VCCV · "onus" · 4 letters · shape VCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "only" for "onus" ever safe?
Frequency check: "only" vs "onus" - which ranks higher?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "only" 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 #362,626 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "only" and "onus" also get mixed up with nearby pairs, the highest-scored neighbour is "onus vs OWS". 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 #362,626 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.