ob vs ONU, What's the Difference?

Which to use

“ob” is a pronoun and “ONU” is an abbrev - they look or sound alike but fill different roles in a sentence.

#28,692
“ob” frequency rank: #3,850
“ONU” frequency rank: 32542
confusion score

Side-by-Side Comparison

Feature	ob	ONU
Definition	eu, pronome pessoal do caso nominativo da primeira pessoa do singular;	sigla para a Organização das Nações Unidas

Letter map: ob vs ONU

Shared letters muted; letters that set ob and ONU apart highlighted. Shared run: 1.

2 ch

3 ch

ONU

Part-of-speech tell for ob / ONU

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: ob is apronoun and ONUanabbrev. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 32542, derived from the frequency rank of both members and their visual similarity.

ob is recorded at frequency rank #28,692, classified as apron, pronounced /ob/. ONU is at rank #3,850, tagged as anabbrev.

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 32542, this pair ranks #35,231 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ob vs ONU

Shared letters: o. Private to "ob": b. Private to "ONU": nu.

"ob" · 2 letters · shape VC · "ONU" · 3 letters · shape VCV

Frequently Asked Questions

Is swapping "ob" for "ONU" ever safe?

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

Frequency check: "ob" vs "ONU" - which ranks higher?

"ONU" is the more common of the two: it sits at frequency rank #3,850 in our Portuguese list, against #28,692 for "ob". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Pair "ob" vs "ONU" is on the table, pick a follow-up below.

Full dictionary entry for "ob" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ONU" - compare definitions side by side with the headword page. Word entry
This pair ranks #35,231 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"ob" and "ONU" also get mixed up with nearby pairs, the highest-scored neighbour is "ob vs oni". Nearby pair

Confusion rank #35,231 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.