sem vs suu, What's the Difference?

Which to use

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

#69
“sem” frequency rank: #47,111
“suu” frequency rank: 47180
confusion score

Side-by-Side Comparison

Feature	sem	suu
Definition	indicativa de carência ou ausência	boca, cavidade oral

Where the eye mixes sem and suu

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

3 ch

sem

3 ch

suu

Visual trap between sem and suu

These two trip readers on the page rather than in the ear: sem is /sɐ̃j̃/ while suu is /ˈsuː/. 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 (preposition vs noun), which is usually the fastest check. Our composite confusion score for this pair is 47180, derived from the frequency rank of both members and their visual similarity.

sem is recorded at frequency rank #69, classified as aprep, pronounced /sɐ̃j̃/. 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 47180, this pair ranks #18,091 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of sem vs suu

Shared letters: s. Private to "sem": em. Private to "suu": u.

"sem" · 3 letters · shape CVC · "suu" · 3 letters · shape CVV

Frequently Asked Questions

Is swapping "sem" for "suu" ever safe?

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

Frequency check: "sem" vs "suu" - which ranks higher?

"sem" is the more common of the two: it sits at frequency rank #69 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

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

Full dictionary entry for "sem" 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 #18,091 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"sem" and "suu" also get mixed up with nearby pairs, the highest-scored neighbour is "Sau vs suu". Nearby pair

Confusion rank #18,091 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.