ak vs ao, What's the Difference?

Which to use

“ak” is a noun and “ao” is a contraction - they look or sound alike but fill different roles in a sentence.

#15,974
“ak” frequency rank: #27
“ao” frequency rank: 16001
confusion score

Side-by-Side Comparison

Feature	ak	ao
Definition	irmão (que não é o primogênito)	contração da preposição a com o artigo definido o

Where the eye mixes ak and ao

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

2 ch

Why the eye confuses ak with ao

These two trip readers on the page rather than in the ear: ak is /ák̚/ while ao is /aw/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - k in “ak” becomes o in “ao”, and the parts of speech differ too (noun vs contraction), which is usually the fastest check. Our composite confusion score for this pair is 16001, derived from the frequency rank of both members and their visual similarity.

ak is recorded at frequency rank #15,974, classified as anoun, pronounced /ák̚/. ao is at rank #27, tagged as acontraction, pronounced /aw/.

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 16001, this pair ranks #55,672 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ak vs ao

Shared letters: a. Private to "ak": k. Private to "ao": o.

"ak" · 2 letters · shape VC · "ao" · 2 letters · shape VV

Frequently Asked Questions

Is swapping "ak" for "ao" ever safe?

No - they are not even the same part of speech. "ak" is a noun and "ao" a contraction, so a sentence built for one is usually ungrammatical with the other.

In ordinary Portuguese text, does "ak" or "ao" show up more?

"ao" is the more common of the two: it sits at frequency rank #27 in our Portuguese list, against #15,974 for "ak". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

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

Full dictionary entry for "ak" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ao" - compare definitions side by side with the headword page. Word entry
This pair ranks #55,672 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"ak" and "ao" also get mixed up with nearby pairs, the highest-scored neighbour is "acs vs ak". Nearby pair

Confusion rank #55,672 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.