Which to use
“sei” is a num and “shi” is a conjunction - they look or sound alike but fill different roles in a sentence.
- #48,072
- “sei” frequency rank
- #21,837
- “shi” frequency rank
- 69909
- confusion score
Side-by-Side Comparison
| Feature | sei | shi |
|---|---|---|
| Definition | Seis. | E, y o &. |
Where the eye mixes sei and shi
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between sei and shi
These two trip readers on the page rather than in the ear: sei is /s̺ej/ while shi is [ʃi]. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - e in “sei” becomes h in “shi”, and the parts of speech differ too (num vs conjunction), which is usually the fastest check. Our composite confusion score for this pair is 69909, 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/. 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 69909, this pair ranks #30,937 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.
Orthographic DNA of sei vs shi
Shared letters: is. Private to "sei": e. Private to "shi": h.
"sei" · 3 letters · shape CVV · "shi" · 3 letters · shape CCV
Frequently Asked Questions
Can "sei" and "shi" be used interchangeably?
In ordinary Spanish text, does "sei" or "shi" show up more?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "sei" 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 #30,937 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "sei" and "shi" also get mixed up with nearby pairs, the highest-scored neighbour is "sei vs stem". Nearby pair
Confusion rank #30,937 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.