al vs auf, What's the Difference?

Which to use

“al” is a contraction and “auf” is an adverb - they look or sound alike but fill different roles in a sentence.

#1,002
“al” frequency rank: #42,318
“auf” frequency rank: 43320
confusion score

Side-by-Side Comparison

Feature	al	auf
Definition	ao (contração da preposição a (Espanhol) e do artigo el (Espanhol)).	aberto

Where the eye mixes al and auf

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

2 ch

3 ch

auf

Visual trap between al and auf

These two trip readers on the page rather than in the ear: al is /al/ while auf is /aʊ̯f/. 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 adverb), which is usually the fastest check. Our composite confusion score for this pair is 43320, derived from the frequency rank of both members and their visual similarity.

al is recorded at frequency rank #1,002, classified as acontraction, pronounced /al/. auf is at rank #42,318, tagged as anadv, pronounced /aʊ̯f/.

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 43320, this pair ranks #22,327 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of al vs auf

Shared letters: a. Private to "al": l. Private to "auf": fu.

"al" · 2 letters · shape VC · "auf" · 3 letters · shape VVC

Frequently Asked Questions

Can "al" and "auf" be used interchangeably?

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

Frequency check: "al" vs "auf" - which ranks higher?

"al" is the more common of the two: it sits at frequency rank #1,002 in our Portuguese list, against #42,318 for "auf". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

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

Full dictionary entry for "al" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "auf" - compare definitions side by side with the headword page. Word entry
This pair ranks #22,327 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"al" and "auf" also get mixed up with nearby pairs, the highest-scored neighbour is "acs vs auf". Nearby pair

Confusion rank #22,327 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.