satvsseiTell them apart

Quick tell: sat is a verb, sei is a num, so they fill different roles in a sentence.

Which to use

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

#16,702
“sat” frequency rank
#48,072
“sei” frequency rank
64774
confusion score

Side-by-Side Comparison

Feature sat sei
Definition Pasado simple del verbo (to) sit. Seis.

Where the eye mixes sat and sei

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch
sat
3 ch
sei

Look-alike desk: sat vs sei

These two trip readers on the page rather than in the ear: sat is /sæt/ while sei is /s̺ej/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (verb vs num), which is usually the fastest check. Our composite confusion score for this pair is 64774, derived from the frequency rank of both members and their visual similarity.

sat is recorded at frequency rank #16,702, classified as averb, pronounced /sæt/. sei is at rank #48,072, tagged as anum, pronounced /s̺ej/.

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 64774, this pair ranks #44,615 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of sat vs sei

Shared letters: s. Private to "sat": at. Private to "sei": ei.

"sat" · 3 letters · shape CVC  ·  "sei" · 3 letters · shape CVV

Frequently Asked Questions

Can "sat" and "sei" be used interchangeably?
No - they are not even the same part of speech. "sat" is a verb and "sei" a num, so a sentence built for one is usually ungrammatical with the other.
In ordinary Spanish text, does "sat" or "sei" show up more?
"sat" is the more common of the two: it sits at frequency rank #16,702 in our Spanish list, against #48,072 for "sei". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

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

  • Full dictionary entry for "sat" 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 #44,615 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "sat" and "sei" also get mixed up with nearby pairs, the highest-scored neighbour is "sei vs stem". Nearby pair

Confusion rank #44,615 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