Which to use
“sem” is a preposition and “ser” is a noun - they look or sound alike but fill different roles in a sentence.
- #69
- “sem” frequency rank
- #30
- “ser” frequency rank
- 99
- confusion score
Side-by-Side Comparison
| Feature | sem | ser |
|---|---|---|
| Definition | indicativa de carência ou ausência | existir, aquilo que supõe-se existir |
Where the eye mixes sem and ser
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses sem with ser
These two trip readers on the page rather than in the ear: sem is /sɐ̃j̃/ while ser is /ˈseɾ/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - m in “sem” becomes r in “ser”, and the parts of speech differ too (preposition vs noun), which is usually the fastest check. Our composite confusion score for this pair is 99, derived from the frequency rank of both members and their visual similarity.
sem is recorded at frequency rank #69, classified as aprep, pronounced /sɐ̃j̃/. ser is at rank #30, tagged as anoun, pronounced /ˈseɾ/.
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 99, this pair ranks #75,558 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of sem vs ser
Shared letters: es. Private to "sem": m. Private to "ser": r.
"sem" · 3 letters · shape CVC · "ser" · 3 letters · shape CVC
Frequently Asked Questions
Do "sem" and "ser" mean the same thing in a sentence?
Frequency check: "sem" vs "ser" - which ranks higher?
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 "sem" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ser" - compare definitions side by side with the headword page. Word entry
- This pair ranks #75,558 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "sem" and "ser" also get mixed up with nearby pairs, the highest-scored neighbour is "Sau vs sem". Nearby pair
Confusion rank #75,558 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.