Aust vs aux, What's the Difference?

Which to use

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

#31,864
“Aust” frequency rank: #16,176
“aux” frequency rank: 48040
confusion score

Side-by-Side Comparison

Feature	Aust	aux
Definition	A small village and civil parish in South Gloucestershire district, Gloucestershire, England, by the Severn Estuary (OS grid ref ST5789).	Abbreviation of auxiliary.

Letter map: Aust vs aux

Shared letters muted; letters that set Aust and aux apart highlighted. Shared run: 2.

4 ch

Aust

3 ch

aux

Role in the sentence - Aust and aux

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: Aust is aname and auxanadjective. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 48040, derived from the frequency rank of both members and their visual similarity.

Aust is recorded at frequency rank #31,864, classified as aname. aux is at rank #16,176, tagged as anadj, pronounced /ˈɔks/.

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 48040, this pair ranks #196,900 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Aust vs aux

Shared letters: au. Private to "Aust": st. Private to "aux": x.

"Aust" · 4 letters · shape VVCC · "aux" · 3 letters · shape VVC

Known mistypes of this pair

Aust ← asut · ausst · austt · auts · uast

Frequently Asked Questions

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

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

In ordinary English text, does "Aust" or "aux" show up more?

"aux" is the more common of the two: it sits at frequency rank #16,176 in our English list, against #31,864 for "Aust". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Pair "Aust" vs "aux" is on the table, pick a follow-up below.

Full dictionary entry for "Aust" 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 #196,900 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"Aust" and "aux" also get mixed up with nearby pairs, the highest-scored neighbour is "Asta vs Aust". 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 #196,900 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.