og vs oni, What's the Difference?

Which to use

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

#36,138
“og” frequency rank: #49,618
“oni” frequency rank: 85756
confusion score

Side-by-Side Comparison

Feature	og	oni
Definition	e:	pronome pessoal do caso nominativo da terceira pessoa do plural de gênero masculino pessoal, eles

Letter map: og vs oni

Shared letters muted; letters that set og and oni apart highlighted. Shared run: 1. og runs 2 letters (VC) against oni's 3 (VCV) - the length gap alone is often enough to separate them once you know to check it.

2 ch

3 ch

oni

Role in the sentence - og and oni

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: og is aconjunction and oniapronoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 85756, 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/. oni is at rank #49,618, 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 85756, this pair ranks #660 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of og vs oni

Shared letters: o. Private to "og": g. Private to "oni": in.

"og" · 2 letters · shape VC · "oni" · 3 letters · shape VCV

Frequently Asked Questions

Do "og" and "oni" mean the same thing in a sentence?

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

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

"og" is the more common of the two: it sits at frequency rank #36,138 in our Portuguese list, against #49,618 for "oni". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Pair "og" vs "oni" is on the table, pick a follow-up below.

Full dictionary entry for "og" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "oni" - compare definitions side by side with the headword page. Word entry
This pair ranks #660 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"og" and "oni" also get mixed up with nearby pairs, the highest-scored neighbour is "oni vs ons". Nearby pair

Confusion rank #660 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.