Which to use
“ASUs” is a noun and “auf” is a preposition - they look or sound alike but fill different roles in a sentence.
- #29,473
- “ASUs” frequency rank
- #15
- “auf” frequency rank
- 29488
- confusion score
Side-by-Side Comparison
| Feature | ASUs | auf |
|---|---|---|
| Definition | Nominativ Plural des Substantivs ASU | an der Oberseite von etwas |
Where the eye mixes ASUs and auf
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses ASUs with auf
These two trip readers on the page rather than in the ear: ASUs is [aːzuːs] 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 (noun vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 29488, derived from the frequency rank of both members and their visual similarity.
ASUs is recorded at frequency rank #29,473, classified as anoun, pronounced [aːzuːs]. auf is at rank #15, tagged as aprep, 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 29488, this pair ranks #1,765,909 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of ASUs vs auf
Shared letters: au. Private to "ASUs": s. Private to "auf": f.
"ASUs" · 4 letters · shape VCVC · "auf" · 3 letters · shape VVC
Known mistypes of this pair
- ASUs ← assu · assus · asuss · saus
Frequently Asked Questions
Is swapping "ASUs" for "auf" ever safe?
Which is more common, "ASUs" or "auf"?
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 "ASUs" 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 #1,765,909 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
- "ASUs" and "auf" also get mixed up with nearby pairs, the highest-scored neighbour is "ASUs vs AUD". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #1,765,909 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.