ao vs aut, What's the Difference?

Which to use

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

#21,556
“ao” frequency rank: #40,662
“aut” frequency rank: 62218
confusion score

Side-by-Side Comparison

Feature	ao	aut
Definition	Contracción de la preposición a ("a") y el artículo o ("el"): (al).	O

Where the eye mixes ao and aut

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

2 ch

3 ch

aut

Look-alike desk: ao vs aut

These two trip readers on the page rather than in the ear: ao is [ɔ] while aut is /ˈawt/. 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 (contraction vs conjunction), which is usually the fastest check. Our composite confusion score for this pair is 62218, derived from the frequency rank of both members and their visual similarity.

ao is recorded at frequency rank #21,556, classified as acontraction, pronounced [ɔ]. aut is at rank #40,662, tagged as aconj, pronounced /ˈawt/.

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 62218, this pair ranks #52,779 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of ao vs aut

Shared letters: a. Private to "ao": o. Private to "aut": tu.

"ao" · 2 letters · shape VV · "aut" · 3 letters · shape VVC

Frequently Asked Questions

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

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

In ordinary Spanish text, does "ao" or "aut" show up more?

"ao" is the more common of the two: it sits at frequency rank #21,556 in our Spanish list, against #40,662 for "aut". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

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 "ao" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "aut" - compare definitions side by side with the headword page. Word entry
This pair ranks #52,779 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
"ao" and "aut" also get mixed up with nearby pairs, the highest-scored neighbour is "anta vs aut". Nearby pair

Confusion rank #52,779 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.