Which to use
“sei” is a num and “sois” is a verb - they look or sound alike but fill different roles in a sentence.
- #48,072
- “sei” frequency rank
- #4,119
- “sois” frequency rank
- 52191
- confusion score
Side-by-Side Comparison
| Feature | sei | sois |
|---|---|---|
| Definition | Seis. | Segunda persona del plural (vosotros, vosotras) del presente de indicativo de ser. |
Where the eye mixes sei and sois
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: sei vs sois
These two trip readers on the page rather than in the ear: sei is /s̺ej/ while sois is [ˈsojs]. 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 (num vs verb), which is usually the fastest check. Our composite confusion score for this pair is 52191, 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/. sois is at rank #4,119, tagged as averb, pronounced [ˈsojs].
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 52191, this pair ranks #93,943 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of sei vs sois
Shared letters: is. Private to "sei": e. Private to "sois": o.
"sei" · 3 letters · shape CVV · "sois" · 4 letters · shape CVVC
Known mistypes of this pair
- sois ← osis · sios · soiss · sosi · ssois
Frequently Asked Questions
Is swapping "sei" for "sois" ever safe?
In ordinary Spanish text, does "sei" or "sois" show up more?
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 "sei" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "sois" - compare definitions side by side with the headword page. Word entry
- This pair ranks #93,943 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "sei" and "sois" also get mixed up with nearby pairs, the highest-scored neighbour is "sei vs stem". 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 #93,943 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.