seen vs sei, What's the Difference?

Which to use

“seen” is a verb and “sei” is an intj - they look or sound alike but fill different roles in a sentence.

#32,769
“seen” frequency rank: #118
“sei” frequency rank: 32887
confusion score

Side-by-Side Comparison

Feature	seen	sei
Definition	particípio do verbo see	expressa que aquilo ouvido que foi dito ou afirmado por alguém não é tomado como sendo a verdade

Letter map: seen vs sei

Shared letters muted; letters that set seen and sei apart highlighted. Shared run: 2.

4 ch

seen

3 ch

sei

Part-of-speech tell for seen / sei

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: seen is averb and seianintj. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 32887, derived from the frequency rank of both members and their visual similarity.

seen is recorded at frequency rank #32,769, classified as averb, pronounced /siːn/, /si:n/. sei is at rank #118, tagged as anintj.

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 32887, this pair ranks #34,779 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of seen vs sei

Shared letters: es. Private to "seen": n. Private to "sei": i.

"seen" · 4 letters · shape CVVC · "sei" · 3 letters · shape CVV

Known mistypes of this pair

seen ← esen · seenn · sene · sseen

Frequently Asked Questions

Do "seen" and "sei" mean the same thing in a sentence?

No - they are not even the same part of speech. "seen" is a verb and "sei" an intj, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "seen" vs "sei" - which ranks higher?

"sei" is the more common of the two: it sits at frequency rank #118 in our Portuguese list, against #32,769 for "seen". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Done with this confusable. These links stay specific to "seen" and "sei".

Full dictionary entry for "seen" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "sei" - compare definitions side by side with the headword page. Word entry
This pair ranks #34,779 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"seen" and "sei" also get mixed up with nearby pairs, the highest-scored neighbour is "seen vs sueño". 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 #34,779 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.