s vs sei, What's the Difference?

Which to use

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

#172
“s” frequency rank: #185
“sei” frequency rank: 357
confusion score

Side-by-Side Comparison

Feature	s	sei
Definition	19. Buchstabe des lateinischen Alphabets, Kleinbuchstabe zu „S“	2. Person Singular Präsens Imperativ Aktiv des Verbs sein

Letter map: s vs sei

Shared letters muted; letters that set s and sei apart highlighted. Shared run: 1.

1 ch

3 ch

sei

Role in the sentence - s and sei

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: s is anabbrev and seiaverb. On the page they differ by 2 extra letter(s) - “s” sits inside “sei”. Our composite confusion score for this pair is 357, derived from the frequency rank of both members and their visual similarity.

s is recorded at frequency rank #172, classified as anabbrev. sei is at rank #185, tagged as averb, pronounced [zaɪ̯].

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 357, this pair ranks #2,005,950 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of s vs sei

Shared letters: s. Private to "s": -. Private to "sei": ei.

"s" · 1 letters · shape C · "sei" · 3 letters · shape CVV

Frequently Asked Questions

Can "s" and "sei" be used interchangeably?

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

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

"s" is the more common of the two: it sits at frequency rank #172 in our German list, against #185 for "sei". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Pair "s" vs "sei" is on the table, pick a follow-up below.

Full dictionary entry for "s" 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 #2,005,950 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
"s" and "sei" also get mixed up with nearby pairs, the highest-scored neighbour is "seg vs sei". Nearby pair

Confusion rank #2,005,950 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.