an vs asa, What's the Difference?

Which to use

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

#2,817
“an” frequency rank: #7,104
“asa” frequency rank: 9921
confusion score

Side-by-Side Comparison

Feature	an	asa
Definition	ligado, aceso:	membro de um animal que serve para o voo

Where the eye mixes an and asa

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

2 ch

3 ch

asa

Visual trap between an and asa

These two trip readers on the page rather than in the ear: an is /an/ while asa is /ˈa.zɐ/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (adverb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 9921, derived from the frequency rank of both members and their visual similarity.

an is recorded at frequency rank #2,817, classified as anadv, pronounced /an/. asa is at rank #7,104, tagged as anoun, pronounced /ˈa.zɐ/.

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 9921, this pair ranks #63,349 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of an vs asa

Shared letters: a. Private to "an": n. Private to "asa": s.

"an" · 2 letters · shape VC · "asa" · 3 letters · shape VCV

Frequently Asked Questions

Can "an" and "asa" be used interchangeably?

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

Frequency check: "an" vs "asa" - which ranks higher?

"an" is the more common of the two: it sits at frequency rank #2,817 in our Portuguese list, against #7,104 for "asa". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Eye-level mix-up between "an" and "asa" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "an" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "asa" - compare definitions side by side with the headword page. Word entry
This pair ranks #63,349 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"an" and "asa" also get mixed up with nearby pairs, the highest-scored neighbour is "acs vs asa". Nearby pair

Confusion rank #63,349 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.