sei vs sep, What's the Difference?

Which to use

“sei” and “sep” are a confusable Spanish pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#48,072
“sei” frequency rank: #8,588
“sep” frequency rank: 56660
confusion score

Side-by-Side Comparison

Feature	sei	sep
Definition	Seis.	Siete.

Where the eye mixes sei and sep

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

3 ch

sei

3 ch

sep

Visual trap between sei and sep

A purely visual mix-up. sei (/s̺ej/) and sep (/sep/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - i in “sei” becomes p in “sep”. Our composite confusion score for this pair is 56660, derived from the frequency rank of both members and their visual similarity.

sei is recorded at frequency rank #48,072, classified as anum, pronounced /s̺ej/. sep is at rank #8,588, tagged as anum, pronounced /sep/.

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 56660, this pair ranks #73,665 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of sei vs sep

Shared letters: es. Private to "sei": i. Private to "sep": p.

"sei" · 3 letters · shape CVV · "sep" · 3 letters · shape CVC

Frequently Asked Questions

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

No. They are said differently (/s̺ej/ versus /sep/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Which is more common, "sei" or "sep"?

"sep" is the more common of the two: it sits at frequency rank #8,588 in our Spanish list, against #48,072 for "sei". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Eye-level mix-up between "sei" and "sep" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "sei" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "sep" - compare definitions side by side with the headword page. Word entry
This pair ranks #73,665 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
"sei" and "sep" also get mixed up with nearby pairs, the highest-scored neighbour is "sei vs stem". Nearby pair

Confusion rank #73,665 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.