sietevssisterWhich spelling fits?

Quick tell: siete is a num, sister is a noun, so they fill different roles in a sentence.

Which to use

“siete” is a num and “sister” is a noun - they look or sound alike but fill different roles in a sentence.

#923
“siete” frequency rank
#36,296
“sister” frequency rank
37219
confusion score

Side-by-Side Comparison

Feature siete sister
Definition Seis y uno. Hermana.

Where the eye mixes siete and sister

Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. siete runs 5 letters (CVVCV) against sister's 6 (CVCCVC) - the length gap alone is often enough to separate them once you know to check it.

5 ch
siete
6 ch
sister

Why the eye confuses siete with sister

These two trip readers on the page rather than in the ear: siete is [ˈsjet̪e] while sister is /ˈsɪs.tə/. 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 noun), which is usually the fastest check. Our composite confusion score for this pair is 37219, derived from the frequency rank of both members and their visual similarity.

siete is recorded at frequency rank #923, classified as anum, pronounced [ˈsjet̪e]. sister is at rank #36,296, tagged as anoun, pronounced /ˈsɪs.tə/.

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 37219, this pair ranks #176,461 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of siete vs sister

Shared letters: eist. Private to "siete": -. Private to "sister": r.

"siete" · 5 letters · shape CVVCV  ·  "sister" · 6 letters · shape CVCCVC

Known mistypes of this pair

  • siete ← ciete · isete · seite · sieet · siette · sitee · ssiete
  • sister ← cister · isster · sisetr · sisster · sisterr · sistre · sistter · sitser

Frequently Asked Questions

Can "siete" and "sister" be used interchangeably?
No - they are not even the same part of speech. "siete" is a num and "sister" a noun, so a sentence built for one is usually ungrammatical with the other.
Frequency check: "siete" vs "sister" - which ranks higher?
"siete" is the more common of the two: it sits at frequency rank #923 in our Spanish list, against #36,296 for "sister". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Eye-level mix-up between "siete" and "sister" is sorted above. Next: full entries or other pairs that share a letter shape.

  • Full dictionary entry for "siete" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "sister" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #176,461 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "siete" and "sister" also get mixed up with nearby pairs, the highest-scored neighbour is "singer vs sister". 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 #176,461 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