Which to use
“Altbau” and “Aufbau” are a confusable German pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #21,516
- “Altbau” frequency rank
- #2,189
- “Aufbau” frequency rank
- 23705
- confusion score
Side-by-Side Comparison
| Feature | Altbau | Aufbau |
|---|---|---|
| Definition | älteres Gebäude, welches noch vor einem bestimmten Zeitpunkt — in der Regel noch vor dem Zweiten Weltkrieg — fertiggestellt worden ist | der Vorgang des Aufbauens eines Gebäudes, eines Systems oder einer sonstwie gearteten Struktur |
Where the eye mixes Altbau and Aufbau
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. Altbau (VCCCVV) and Aufbau (VVCCVV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses Altbau with Aufbau
A purely visual mix-up. Altbau ([ˈaltˌbaʊ̯]) and Aufbau ([ˈaʊ̯fˌbaʊ̯]) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 23705, derived from the frequency rank of both members and their visual similarity.
Altbau is recorded at frequency rank #21,516, classified as anoun, pronounced [ˈaltˌbaʊ̯]. Aufbau is at rank #2,189, tagged as anoun, pronounced [ˈaʊ̯fˌbaʊ̯].
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 23705, this pair ranks #1,857,737 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of Altbau vs Aufbau
Shared letters: abu. Private to "Altbau": lt. Private to "Aufbau": f.
"Altbau" · 6 letters · shape VCCCVV · "Aufbau" · 6 letters · shape VVCCVV
Known mistypes of this pair
Frequently Asked Questions
Do "Altbau" and "Aufbau" mean the same thing in a sentence?
In ordinary German text, does "Altbau" or "Aufbau" show up more?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "Altbau" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "Aufbau" - compare definitions side by side with the headword page. Word entry
- This pair ranks #1,857,737 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
- "Altbau" and "Aufbau" also get mixed up with nearby pairs, the highest-scored neighbour is "Alban vs Altbau". 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 #1,857,737 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.