ach vs ao, What's the Difference?

Which to use

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

#48,212
“ach” frequency rank: #27
“ao” frequency rank: 48239
confusion score

Side-by-Side Comparison

Feature	ach	ao
Definition	oh	contração da preposição a com o artigo definido o

Letter map: ach vs ao

Shared letters muted; letters that set ach and ao apart highlighted. Shared run: 1.

3 ch

ach

2 ch

Part-of-speech tell for ach / ao

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: ach is anintj and aoacontraction. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 48239, derived from the frequency rank of both members and their visual similarity.

ach is recorded at frequency rank #48,212, classified as anintj. 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 48239, this pair ranks #16,960 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of ach vs ao

Shared letters: a. Private to "ach": ch. Private to "ao": o.

"ach" · 3 letters · shape VCC · "ao" · 2 letters · shape VV

Frequently Asked Questions

Can "ach" and "ao" be used interchangeably?

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

Which is more common, "ach" or "ao"?

"ao" is the more common of the two: it sits at frequency rank #27 in our Portuguese list, against #48,212 for "ach". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

You've compared "ach" and "ao". Here's where to go from here.

Full dictionary entry for "ach" 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 #16,960 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"ach" and "ao" also get mixed up with nearby pairs, the highest-scored neighbour is "ach vs acs". Nearby pair

Confusion rank #16,960 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.