Which to use
“act” is a noun and “aux” is an article - they look or sound alike but fill different roles in a sentence.
- #10,437
- “act” frequency rank
- #58
- “aux” frequency rank
- 10495
- confusion score
Side-by-Side Comparison
| Feature | act | aux |
|---|---|---|
| Definition | Action. | Contraction obligatoire de la préposition à et de l'article défini les. |
Where the eye mixes act and aux
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Look-alike desk: act vs aux
These two trip readers on the page rather than in the ear: act is \ækt\ while aux is \o\. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (noun vs article), which is usually the fastest check. Our composite confusion score for this pair is 10495, derived from the frequency rank of both members and their visual similarity.
act is recorded at frequency rank #10,437, classified as anoun, pronounced \ækt\. 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 10495, this pair ranks #412,768 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of act vs aux
Shared letters: a. Private to "act": ct. Private to "aux": ux.
"act" · 3 letters · shape VCC · "aux" · 3 letters · shape VVC
Frequently Asked Questions
Do "act" and "aux" mean the same thing in a sentence?
Which is more common, "act" or "aux"?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "act" 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 #412,768 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "act" and "aux" also get mixed up with nearby pairs, the highest-scored neighbour is "act vs aur". Nearby pair
Confusion rank #412,768 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.