Which to use
“A1” is a noun and “Aa” is a name - they look or sound alike but fill different roles in a sentence.
- #17,858
- “A1” frequency rank
- #12,704
- “Aa” frequency rank
- 30562
- confusion score
Side-by-Side Comparison
| Feature | A1 | Aa |
|---|---|---|
| Definition | Format d'une feuille de 594,6 mm sur 840,9. | Abréviation standard du mycologue néerlandais Hubertus Antonius van der Aa. |
Letter map: A1 vs Aa
Shared letters muted; letters that set A1 and Aa apart highlighted. Shared run: 1.
Part-of-speech tell for A1 / Aa
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: A1 is anoun and Aaaname. On the page they differ by a single letter - 1 in “A1” becomes a in “Aa”. Our composite confusion score for this pair is 30562, derived from the frequency rank of both members and their visual similarity.
A1 is recorded at frequency rank #17,858, classified as anoun, pronounced \a.œ̃\. Aa is at rank #12,704, tagged as aname.
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 30562, this pair ranks #309,473 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of A1 vs Aa
Shared letters: a. Private to "A1": -. Private to "Aa": -.
"A1" · 1 letters · shape V · "Aa" · 2 letters · shape VV
Frequently Asked Questions
Is swapping "A1" for "Aa" ever safe?
In ordinary French text, does "A1" or "Aa" show up more?
After this comparison
You've compared "A1" and "Aa". Here's where to go from here.
- Full dictionary entry for "A1" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "Aa" - compare definitions side by side with the headword page. Word entry
- This pair ranks #309,473 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "A1" and "Aa" also get mixed up with nearby pairs, the highest-scored neighbour is "A1 vs aur". Nearby pair
Confusion rank #309,473 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.