Which to use
“acs” is a noun and “auf” is an adverb - they look or sound alike but fill different roles in a sentence.
- #49,775
- “acs” frequency rank
- #42,318
- “auf” frequency rank
- 92093
- confusion score
Side-by-Side Comparison
| Feature | acs | auf |
|---|---|---|
| Definition | olho (órgão da visão) | aberto |
Where the eye mixes acs and auf
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence. acs (VCC) and auf (VVC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Look-alike desk: acs vs auf
These two trip readers on the page rather than in the ear: acs is [ats] while auf is /aʊ̯f/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (noun vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 92093, derived from the frequency rank of both members and their visual similarity.
acs is recorded at frequency rank #49,775, classified as anoun, pronounced [ats]. 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 92093, this pair ranks #175 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.
Orthographic DNA of acs vs auf
Shared letters: a. Private to "acs": cs. Private to "auf": fu.
"acs" · 3 letters · shape VCC · "auf" · 3 letters · shape VVC
Frequently Asked Questions
Is swapping "acs" for "auf" ever safe?
Frequency check: "acs" vs "auf" - which ranks higher?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "acs" 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 #175 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "acs" and "auf" also get mixed up with nearby pairs, the highest-scored neighbour is "acs vs ASC". Nearby pair
Confusion rank #175 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.