Which to use
“A1” is a noun and “A4” is a symbol - they look or sound alike but fill different roles in a sentence.
- #17,858
- “A1” frequency rank
- #18,920
- “A4” frequency rank
- 36778
- confusion score
Side-by-Side Comparison
| Feature | A1 | A4 |
|---|---|---|
| Definition | Format d'une feuille de 594,6 mm sur 840,9. | Format de papier de 210 mm × 297 mm. |
Letter map: A1 vs A4
Shared letters muted; letters that set A1 and A4 apart highlighted. Shared run: 1.
Role in the sentence - A1 and A4
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: A1 is anoun and A4asymbol. On the page they differ by a single letter - 1 in “A1” becomes 4 in “A4”. Our composite confusion score for this pair is 36778, 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\. A4 is at rank #18,920, tagged as asymbol.
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 36778, this pair ranks #267,196 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of A1 vs A4
Shared letters: a. Private to "A1": -. Private to "A4": -.
"A1" · 1 letters · shape V · "A4" · 1 letters · shape V
Frequently Asked Questions
Do "A1" and "A4" mean the same thing in a sentence?
Frequency check: "A1" vs "A4" - which ranks higher?
Useful next steps
You've compared "A1" and "A4". Here's where to go from here.
- Full dictionary entry for "A1" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "A4" - compare definitions side by side with the headword page. Word entry
- This pair ranks #267,196 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "A1" and "A4" also get mixed up with nearby pairs, the highest-scored neighbour is "A4 vs aur". Nearby pair
Confusion rank #267,196 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.