Aa vs aux, What's the Difference?

Which to use

“Aa” is a name and “aux” is an article - they look or sound alike but fill different roles in a sentence.

#12,704
“Aa” frequency rank: #58
“aux” frequency rank: 12762
confusion score

Side-by-Side Comparison

Feature	Aa	aux
Definition	Abréviation standard du mycologue néerlandais Hubertus Antonius van der Aa.	Contraction obligatoire de la préposition à et de l'article défini les.

Letter map: Aa vs aux

Shared letters muted; letters that set Aa and aux apart highlighted. Shared run: 1.

2 ch

3 ch

aux

Part-of-speech tell for Aa / aux

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: Aa is aname and auxanarticle. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 12762, derived from the frequency rank of both members and their visual similarity.

Aa is recorded at frequency rank #12,704, classified as aname. aux is at rank #58, tagged as anarticle, pronounced \o\.

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 12762, this pair ranks #403,877 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of Aa vs aux

Shared letters: a. Private to "Aa": -. Private to "aux": ux.

"Aa" · 2 letters · shape VV · "aux" · 3 letters · shape VVC

Frequently Asked Questions

Is swapping "Aa" for "aux" ever safe?

No - they are not even the same part of speech. "Aa" is a name and "aux" an article, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "Aa" or "aux"?

"aux" is the more common of the two: it sits at frequency rank #58 in our French list, against #12,704 for "Aa". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

You've compared "Aa" and "aux". Here's where to go from here.

Full dictionary entry for "Aa" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "aux" - compare definitions side by side with the headword page. Word entry
This pair ranks #403,877 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"Aa" and "aux" also get mixed up with nearby pairs, the highest-scored neighbour is "Aa vs aur". Nearby pair

Confusion rank #403,877 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.