os vs oss, What's the Difference?

Which to use

“os” is an article and “oss” is a pronoun - they look or sound alike but fill different roles in a sentence.

#19
“os” frequency rank: #31,905
“oss” frequency rank: 31924
confusion score

Side-by-Side Comparison

Feature	os	oss
Definition	usado para apontar um nome definido, único	nos

Letter map: os vs oss

Shared letters muted; letters that set os and oss apart highlighted. Shared run: 2.

2 ch

3 ch

oss

Role in the sentence - os and oss

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: os is anarticle and ossapronoun. On the page they differ by 1 extra letter(s) - “os” sits inside “oss”. Our composite confusion score for this pair is 31924, derived from the frequency rank of both members and their visual similarity.

os is recorded at frequency rank #19, classified as anarticle, pronounced /uʃ/, /us/ (menos frequente); enfático: /oʃ/, /os/ (menos frequente). oss is at rank #31,905, tagged as apron.

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 31924, this pair ranks #36,015 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of os vs oss

Shared letters: os. Private to "os": -. Private to "oss": -.

"os" · 2 letters · shape VC · "oss" · 3 letters · shape VCC

Frequently Asked Questions

Is swapping "os" for "oss" ever safe?

No - they are not even the same part of speech. "os" is an article and "oss" a pronoun, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "os" or "oss"?

"os" is the more common of the two: it sits at frequency rank #19 in our Portuguese list, against #31,905 for "oss". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Pair "os" vs "oss" is on the table, pick a follow-up below.

Full dictionary entry for "os" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "oss" - compare definitions side by side with the headword page. Word entry
This pair ranks #36,015 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"os" and "oss" also get mixed up with nearby pairs, the highest-scored neighbour is "oni vs oss". Nearby pair

Confusion rank #36,015 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.