Which to use
“OAS” is a name and “opus” is a noun - they look or sound alike but fill different roles in a sentence.
- #44,377
- “OAS” frequency rank
- #23,619
- “opus” frequency rank
- 67996
- confusion score
Side-by-Side Comparison
| Feature | OAS | opus |
|---|---|---|
| Definition | Initialism of Organization of American States. | A work of music or set of works with a specified rank in an ordering of a composer's complete published works. |
Letter map: OAS vs opus
Shared letters muted; letters that set OAS and opus apart highlighted. Shared run: 2.
Part-of-speech tell for OAS / opus
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: OAS is aname and opusanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 67996, derived from the frequency rank of both members and their visual similarity.
OAS is recorded at frequency rank #44,377, classified as aname. opus is at rank #23,619, tagged as anoun, pronounced /ˈəʊpəs/.
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 67996, this pair ranks #60,886 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of OAS vs opus
Shared letters: os. Private to "OAS": a. Private to "opus": pu.
"OAS" · 3 letters · shape VVC · "opus" · 4 letters · shape VCVC
Known mistypes of this pair
- opus ← oppus · opsu · opuss · oups · pous
Frequently Asked Questions
Is swapping "OAS" for "opus" ever safe?
In ordinary English text, does "OAS" or "opus" show up more?
After this comparison
Pair "OAS" vs "opus" is on the table, pick a follow-up below.
- Full dictionary entry for "OAS" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "opus" - compare definitions side by side with the headword page. Word entry
- This pair ranks #60,886 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "OAS" and "opus" also get mixed up with nearby pairs, the highest-scored neighbour is "OAS 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 #60,886 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.