seca vs sem, What's the Difference?

Which to use

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

#2,805
“seca” frequency rank: #69
“sem” frequency rank: 2874
confusion score

Side-by-Side Comparison

Feature	seca	sem
Definition	período sem chuva	indicativa de carência ou ausência

Where the eye mixes seca and sem

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

4 ch

seca

3 ch

sem

Visual trap between seca and sem

These two trip readers on the page rather than in the ear: seca is /ˈsɛ.kɐ/ while sem is /sɐ̃j̃/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 2874, derived from the frequency rank of both members and their visual similarity.

seca is recorded at frequency rank #2,805, classified as anoun, pronounced /ˈsɛ.kɐ/. 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 2874, this pair ranks #72,369 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of seca vs sem

Shared letters: es. Private to "seca": ac. Private to "sem": m.

"seca" · 4 letters · shape CVCV · "sem" · 3 letters · shape CVC

Known mistypes of this pair

seca ← esca · scea · seac · secca · sseca

Frequently Asked Questions

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

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

In ordinary Portuguese text, does "seca" or "sem" show up more?

"sem" is the more common of the two: it sits at frequency rank #69 in our Portuguese list, against #2,805 for "seca". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "seca" 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 #72,369 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"seca" and "sem" also get mixed up with nearby pairs, the highest-scored neighbour is "seca vs senda". 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 #72,369 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.