mayvsmuiTell them apart

Quick tell: may is a verb, mui is an adverb, so they fill different roles in a sentence.

Which to use

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

#5,226
“may” frequency rank
#23,741
“mui” frequency rank
28967
confusion score

Side-by-Side Comparison

Feature may mui
Definition obter permissão. Também utilizado quando se deseja fazer um pedido, de maneira cortês. em alto grau

Where the eye mixes may and mui

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

3 ch
may
3 ch
mui

Why the eye confuses may with mui

These two trip readers on the page rather than in the ear: may is /meɪ/ while mui is /ˈmũj/. 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 (verb vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 28967, derived from the frequency rank of both members and their visual similarity.

may is recorded at frequency rank #5,226, classified as averb, pronounced /meɪ/. mui is at rank #23,741, tagged as anadv, pronounced /ˈmũj/.

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 28967, this pair ranks #39,778 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of may vs mui

Shared letters: m. Private to "may": ay. Private to "mui": iu.

"may" · 3 letters · shape CVV  ·  "mui" · 3 letters · shape CVV

Frequently Asked Questions

Can "may" and "mui" be used interchangeably?
No - they are not even the same part of speech. "may" is a verb and "mui" an adverb, so a sentence built for one is usually ungrammatical with the other.
In ordinary Portuguese text, does "may" or "mui" show up more?
"may" is the more common of the two: it sits at frequency rank #5,226 in our Portuguese list, against #23,741 for "mui". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

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

  • Full dictionary entry for "may" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "mui" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #39,778 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
  • "may" and "mui" also get mixed up with nearby pairs, the highest-scored neighbour is "maa vs mui". Nearby pair

Confusion rank #39,778 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list