seinvsshiWhich spelling fits?

Quick tell: sein is a verb, shi is a conjunction, so they fill different roles in a sentence.

Which to use

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

#45,601
“sein” frequency rank
#21,837
“shi” frequency rank
67438
confusion score

Side-by-Side Comparison

Feature sein shi
Definition Ser, estar. E, y o &.

Where the eye mixes sein and shi

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

4 ch
sein
3 ch
shi

Visual trap between sein and shi

These two trip readers on the page rather than in the ear: sein is [ˈzaɪ̯n] while shi is [ʃi]. 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 conjunction), which is usually the fastest check. Our composite confusion score for this pair is 67438, derived from the frequency rank of both members and their visual similarity.

sein is recorded at frequency rank #45,601, classified as averb, pronounced [ˈzaɪ̯n]. shi is at rank #21,837, tagged as aconj, pronounced [ʃi].

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 67438, this pair ranks #37,115 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of sein vs shi

Shared letters: is. Private to "sein": en. Private to "shi": h.

"sein" · 4 letters · shape CVVC  ·  "shi" · 3 letters · shape CCV

Known mistypes of this pair

  • seinesin · seinn · seni · ssein

Frequently Asked Questions

Do "sein" and "shi" mean the same thing in a sentence?
No - they are not even the same part of speech. "sein" is a verb and "shi" a conjunction, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "sein" or "shi"?
"shi" is the more common of the two: it sits at frequency rank #21,837 in our Spanish list, against #45,601 for "sein". 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 "sein" and "shi" is sorted above. Next: full entries or other pairs that share a letter shape.

  • Full dictionary entry for "sein" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "shi" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #37,115 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "sein" and "shi" also get mixed up with nearby pairs, the highest-scored neighbour is "sei vs sein". 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 #37,115 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list