sei vs suu, What's the Difference?

Which to use

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

#118
“sei” frequency rank: #47,111
“suu” frequency rank: 47229
confusion score

Side-by-Side Comparison

Feature	sei	suu
Definition	expressa que aquilo ouvido que foi dito ou afirmado por alguém não é tomado como sendo a verdade	boca, cavidade oral

Letter map: sei vs suu

Shared letters muted; letters that set sei and suu apart highlighted. Shared run: 1.

3 ch

sei

3 ch

suu

Role in the sentence - sei and suu

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: sei is anintj and suuanoun. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 47229, derived from the frequency rank of both members and their visual similarity.

sei is recorded at frequency rank #118, classified as anintj. suu is at rank #47,111, tagged as anoun, pronounced /ˈsuː/.

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 47229, this pair ranks #18,038 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of sei vs suu

Shared letters: s. Private to "sei": ei. Private to "suu": u.

"sei" · 3 letters · shape CVV · "suu" · 3 letters · shape CVV

Frequently Asked Questions

Can "sei" and "suu" be used interchangeably?

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

In ordinary Portuguese text, does "sei" or "suu" show up more?

"sei" is the more common of the two: it sits at frequency rank #118 in our Portuguese list, against #47,111 for "suu". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

You've compared "sei" and "suu". Here's where to go from here.

Full dictionary entry for "sei" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "suu" - compare definitions side by side with the headword page. Word entry
This pair ranks #18,038 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"sei" and "suu" also get mixed up with nearby pairs, the highest-scored neighbour is "Sau vs suu". Nearby pair

Confusion rank #18,038 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.