aço vs ao, What's the Difference?

Which to use

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

#4,209
“aço” frequency rank: #27
“ao” frequency rank: 4236
confusion score

Side-by-Side Comparison

Feature	aço	ao
Definition	liga composta principalmente de ferro e carbono utilizada para a fabricação de utensílios, armas, veículos e uma infinidade de outros objetos da vida moderna	contração da preposição a com o artigo definido o

Where the spellings diverge

Shared letters are muted; the letters that actually set aço and ao apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

3 ch

aço

2 ch

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: aço is /ˈa.su/ while ao is /aw/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs contraction), which is usually the fastest check. Our composite confusion score for this pair is 4236, derived from the frequency rank of both members and their visual similarity.

aço is recorded at frequency rank #4,209, classified as anoun, pronounced /ˈa.su/. 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 4236, this pair ranks #70,742 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of aço vs ao

Shared letters: ao. Private to "aço": ç. Private to "ao": -.

"aço" · 3 letters · shape VCV · "ao" · 2 letters · shape VV

Frequency comparison

aço#4,209

ao#27

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

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

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

Which is more common, "aço" or "ao"?

"ao" is the more common of the two: it sits at frequency rank #27 in our Portuguese list, against #4,209 for "aço". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Remembering aço vs ao

The fastest way to pick the right one every time.

Check the role first: if you need a noun, it's “aço”; for a contraction, it's “ao”.
See each word in full, definition, IPA, etymology and its other confusables. Full “aço” entry
Browse more pairs most likely to be confused. Most confusable