Sau vs sem, What's the Difference?

Which to use

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

#49,171
“Sau” frequency rank: #69
“sem” frequency rank: 49240
confusion score

Side-by-Side Comparison

Feature	Sau	sem
Definition	porco	indicativa de carência ou ausência

Where the eye mixes Sau and sem

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

3 ch

sem

Visual trap between Sau and sem

These two trip readers on the page rather than in the ear: Sau is /zaʊ̯/ while sem is /sɐ̃j̃/. 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 (noun vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 49240, derived from the frequency rank of both members and their visual similarity.

Sau is recorded at frequency rank #49,171, classified as anoun, pronounced /zaʊ̯/. sem is at rank #69, tagged as aprep, pronounced /sɐ̃j̃/.

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 49240, this pair ranks #15,810 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of Sau vs sem

Shared letters: s. Private to "Sau": au. Private to "sem": em.

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

Frequently Asked Questions

Can "Sau" and "sem" be used interchangeably?

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

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

"sem" is the more common of the two: it sits at frequency rank #69 in our Portuguese list, against #49,171 for "Sau". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

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

Full dictionary entry for "Sau" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "sem" - compare definitions side by side with the headword page. Word entry
This pair ranks #15,810 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"Sau" and "sem" also get mixed up with nearby pairs, the highest-scored neighbour is "Sau vs soap". Nearby pair

Confusion rank #15,810 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.