APL vs aux, What's the Difference?

Which to use

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

#48,593
“APL” frequency rank: #16,176
“aux” frequency rank: 64769
confusion score

Side-by-Side Comparison

Feature	APL	aux
Definition	Initialism of acute promyelocytic leukemia.	Abbreviation of auxiliary.

Letter map: APL vs aux

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

3 ch

APL

3 ch

aux

Role in the sentence - APL and aux

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: APL is anoun and auxanadjective. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 64769, derived from the frequency rank of both members and their visual similarity.

APL is recorded at frequency rank #48,593, classified as anoun. 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 64769, this pair ranks #76,084 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of APL vs aux

Shared letters: a. Private to "APL": lp. Private to "aux": ux.

"APL" · 3 letters · shape VCC · "aux" · 3 letters · shape VVC

Frequently Asked Questions

Do "APL" and "aux" mean the same thing in a sentence?

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

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

"aux" is the more common of the two: it sits at frequency rank #16,176 in our English list, against #48,593 for "APL". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Done with this confusable. These links stay specific to "APL" and "aux".

Full dictionary entry for "APL" 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 #76,084 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"APL" and "aux" also get mixed up with nearby pairs, the highest-scored neighbour is "amb vs APL". Nearby pair

Confusion rank #76,084 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.