Which to use
“sis” and “sky” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #12,501
- “sis” frequency rank
- #1,968
- “sky” frequency rank
- 14469
- confusion score
Side-by-Side Comparison
| Feature | sis | sky |
|---|---|---|
| Definition | Clipping of sister. | The atmosphere above a given point, especially as visible from the surface of the Earth as the place where the sun, moon, stars, and clouds are seen. |
Where the eye mixes sis and sky
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Visual trap between sis and sky
A purely visual mix-up. sis (/sɪs/) and sky (/skaɪ/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 14469, derived from the frequency rank of both members and their visual similarity.
sis is recorded at frequency rank #12,501, classified as anoun, pronounced /sɪs/. sky is at rank #1,968, tagged as anoun, pronounced /skaɪ/.
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 14469, this pair ranks #469,861 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of sis vs sky
Shared letters: s. Private to "sis": i. Private to "sky": ky.
"sis" · 3 letters · shape CVC · "sky" · 3 letters · shape CCV
Frequently Asked Questions
Is swapping "sis" for "sky" ever safe?
In ordinary English text, does "sis" or "sky" show up more?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "sis" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "sky" - compare definitions side by side with the headword page. Word entry
- This pair ranks #469,861 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "sis" and "sky" also get mixed up with nearby pairs, the highest-scored neighbour is "sis vs suds". Nearby pair
Confusion rank #469,861 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.