sein vs seu, What's the Difference?

Which to use

“sein” is a verb and “seu” is a noun - they look or sound alike but fill different roles in a sentence.

#43,647
“sein” frequency rank: #31
“seu” frequency rank: 43678
confusion score

Side-by-Side Comparison

Feature	sein	seu
Definition	ser, estar.	senhor

Letter map: sein vs seu

Shared letters muted; letters that set sein and seu apart highlighted. Shared run: 2.

4 ch

sein

3 ch

seu

Role in the sentence - sein and seu

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: sein is averb and seuanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 43678, derived from the frequency rank of both members and their visual similarity.

sein is recorded at frequency rank #43,647, classified as averb, pronounced /zaɪ̯n/. seu is at rank #31, tagged as anoun.

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 43678, this pair ranks #21,942 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of sein vs seu

Shared letters: es. Private to "sein": in. Private to "seu": u.

"sein" · 4 letters · shape CVVC · "seu" · 3 letters · shape CVV

Known mistypes of this pair

sein ← esin · seinn · seni · sien · ssein

Frequently Asked Questions

Do "sein" and "seu" mean the same thing in a sentence?

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

In ordinary Portuguese text, does "sein" or "seu" show up more?

"seu" is the more common of the two: it sits at frequency rank #31 in our Portuguese list, against #43,647 for "sein". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Done with this confusable. These links stay specific to "sein" and "seu".

Full dictionary entry for "sein" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "seu" - compare definitions side by side with the headword page. Word entry
This pair ranks #21,942 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"sein" and "seu" also get mixed up with nearby pairs, the highest-scored neighbour is "sein vs slip". 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 #21,942 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.