As vs ato, What's the Difference?

Which to use

“As” and “ato” are a confusable Portuguese pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#22
“As” frequency rank: #1,326
“ato” frequency rank: 1348
confusion score

Side-by-Side Comparison

Feature	As	ato
Definition	forma obsoleta de Ass	processo de fazer algo; manifestação real e tangível

Where the eye mixes As and ato

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

2 ch

3 ch

ato

Visual trap between As and ato

A purely visual mix-up. As (/as/) and ato (/ˈato/ ou /ˈatu/_(plural:) /ˈatos/, /ˈatus/ ou /ˈatuʃ/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 1348, derived from the frequency rank of both members and their visual similarity.

As is recorded at frequency rank #22, classified as anoun, pronounced /as/. ato is at rank #1,326, tagged as anoun, pronounced /ˈato/ ou /ˈatu/_(plural:) /ˈatos/, /ˈatus/ ou /ˈatuʃ/.

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 1348, this pair ranks #74,239 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of As vs ato

Shared letters: a. Private to "As": s. Private to "ato": ot.

"As" · 2 letters · shape VC · "ato" · 3 letters · shape VCV

Frequently Asked Questions

Is swapping "As" for "ato" ever safe?

No. They are said differently (/as/ versus /ˈato/ ou /ˈatu/_(plural:) /ˈatos/, /ˈatus/ ou /ˈatuʃ/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

In ordinary Portuguese text, does "As" or "ato" show up more?

"As" is the more common of the two: it sits at frequency rank #22 in our Portuguese list, against #1,326 for "ato". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "As" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ato" - compare definitions side by side with the headword page. Word entry
This pair ranks #74,239 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"As" and "ato" also get mixed up with nearby pairs, the highest-scored neighbour is "acs vs ato". Nearby pair

Confusion rank #74,239 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.