segavssemWhat's the difference?

Quick tell: sega is a noun, sem is a preposition, so they fill different roles in a sentence.

Which to use

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

#31,553
“sega” frequency rank
#69
“sem” frequency rank
31622
confusion score

Side-by-Side Comparison

Feature sega sem
Definition serra (instrumento usado para serrar, cortar) indicativa de carência ou ausência

Where the eye mixes sega and sem

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

4 ch
sega
3 ch
sem

Visual trap between sega and sem

These two trip readers on the page rather than in the ear: sega is /ˈsɛ.ɡa/ 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 31622, derived from the frequency rank of both members and their visual similarity.

sega is recorded at frequency rank #31,553, classified as anoun, pronounced /ˈsɛ.ɡa/. 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 31622, this pair ranks #36,406 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of sega vs sem

Shared letters: es. Private to "sega": ag. Private to "sem": m.

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

Known mistypes of this pair

  • segaesga · seag · segga · sgea · ssega

Frequently Asked Questions

Can "sega" and "sem" be used interchangeably?
No - they are not even the same part of speech. "sega" is a noun and "sem" a preposition, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "sega" or "sem"?
"sem" is the more common of the two: it sits at frequency rank #69 in our Portuguese list, against #31,553 for "sega". 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 "sega" 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 #36,406 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
  • "sega" and "sem" also get mixed up with nearby pairs, the highest-scored neighbour is "sega 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 #36,406 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list