og vs os, What's the Difference?

Which to use

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

#36,138
“og” frequency rank: #19
“os” frequency rank: 36157
confusion score

Side-by-Side Comparison

Feature	og	os
Definition	e:	usado para apontar um nome definido, único

Where the eye mixes og and os

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

2 ch

Visual trap between og and os

These two trip readers on the page rather than in the ear: og is /ɔ/ while os is /uʃ/, /us/ (menos frequente); enfático: /oʃ/, /os/ (menos frequente). Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - g in “og” becomes s in “os”, and the parts of speech differ too (conjunction vs article), which is usually the fastest check. Our composite confusion score for this pair is 36157, derived from the frequency rank of both members and their visual similarity.

og is recorded at frequency rank #36,138, classified as aconj, pronounced /ɔ/. os is at rank #19, tagged as anarticle, pronounced /uʃ/, /us/ (menos frequente); enfático: /oʃ/, /os/ (menos frequente).

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 36157, this pair ranks #30,721 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of og vs os

Shared letters: o. Private to "og": g. Private to "os": s.

"og" · 2 letters · shape VC · "os" · 2 letters · shape VC

Frequently Asked Questions

Can "og" and "os" be used interchangeably?

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

In ordinary Portuguese text, does "og" or "os" show up more?

"os" is the more common of the two: it sits at frequency rank #19 in our Portuguese list, against #36,138 for "og". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

Full dictionary entry for "og" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "os" - compare definitions side by side with the headword page. Word entry
This pair ranks #30,721 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"og" and "os" also get mixed up with nearby pairs, the highest-scored neighbour is "og vs oni". Nearby pair

Confusion rank #30,721 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.