sein vs série, What's the Difference?

Which to use

“sein” is a verb and “série” is a noun - they look or sound alike but fill different roles in a sentence.

#43,647
“sein” frequency rank: #337
“série” frequency rank: 43984
confusion score

Side-by-Side Comparison

Feature	sein	série
Definition	ser, estar.	conjunto de pessoas ou itens com ordenação sequencial:

Where the spellings diverge

Shared letters are muted; the letters that actually set sein and série apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

4 ch

sein

5 ch

série

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: sein is /zaɪ̯n/ while série is /ˈsɛ.ɾi/. 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 (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 43984, derived from the frequency rank of both members and their visual similarity.

sein is recorded at frequency rank #43,647, classified as averb, pronounced /zaɪ̯n/. série is at rank #337, tagged as anoun, pronounced /ˈsɛ.ɾi/.

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 43984, this pair ranks #21,581 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of sein vs série

Shared letters: eis. Private to "sein": n. Private to "série": ré.

"sein" · 4 letters · shape CVVC · "série" · 5 letters · shape CVCVV

Known mistypes of this pair

sein ← esin · seinn · seni · sien · ssein

Frequency comparison

sein#43,647

série#337

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "sein" and "série" be used interchangeably?

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

Which is more common, "sein" or "série"?

"série" is the more common of the two: it sits at frequency rank #337 in our Portuguese list, against #43,647 for "sein". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Remembering sein vs série

The fastest way to pick the right one every time.

Check the role first: if you need a verb, it's “sein”; for a noun, it's “série”.
See each word in full, definition, IPA, etymology and its other confusables. Full “sein” entry
Browse more pairs most likely to be confused. Most confusable