seinsvsSinusTell them apart

Quick tell: seins is a unknown, Sinus is a noun, so they fill different roles in a sentence.

Which to use

“seins” is an unknown and “Sinus” is a noun - they look or sound alike but fill different roles in a sentence.

#15,475
“seins” frequency rank
#36,626
“Sinus” frequency rank
52101
confusion score

Side-by-Side Comparison

Feature seins Sinus
Definition Nominativ Singular Neutrum bei nicht attributivem Gebrauch des Possessivpronomens sein eine trigonometrische Funktion

Where the eye mixes seins and Sinus

Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. seins (CVVCC) and Sinus (CVCVC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.

5 ch
seins
5 ch
Sinus

Visual trap between seins and Sinus

These two trip readers on the page rather than in the ear: seins is [zaɪ̯ns] while Sinus is [ˈziːnʊs]. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 3 positions, and the parts of speech differ too (unknown vs noun), which is usually the fastest check. Our composite confusion score for this pair is 52101, derived from the frequency rank of both members and their visual similarity.

seins is recorded at frequency rank #15,475, classified as anunknown, pronounced [zaɪ̯ns]. Sinus is at rank #36,626, tagged as anoun, pronounced [ˈziːnʊs].

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 52101, this pair ranks #1,109,912 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of seins vs Sinus

Shared letters: ins. Private to "seins": e. Private to "Sinus": u.

"seins" · 5 letters · shape CVVCC  ·  "Sinus" · 5 letters · shape CVCVC

Known mistypes of this pair

  • seins ← esins · seinns · seinss · seisn · senis · siens · sseins
  • Sinus ← isnus · sinnus · sinsu · sinuss · siuns · snius · ssinus

Frequently Asked Questions

Can "seins" and "Sinus" be used interchangeably?
No - they are not even the same part of speech. "seins" is an unknown and "Sinus" a noun, so a sentence built for one is usually ungrammatical with the other.
Frequency check: "seins" vs "Sinus" - which ranks higher?
"seins" is the more common of the two: it sits at frequency rank #15,475 in our German list, against #36,626 for "Sinus". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

  • Full dictionary entry for "seins" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "Sinus" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #1,109,912 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
  • "seins" and "Sinus" also get mixed up with nearby pairs, the highest-scored neighbour is "sands vs Sinus". 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 #1,109,912 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list