Which to use
“sik” is an adjective and “sill” is a noun - they look or sound alike but fill different roles in a sentence.
- #40,893
- “sik” frequency rank
- #29,086
- “sill” frequency rank
- 69979
- confusion score
Side-by-Side Comparison
| Feature | sik | sill |
|---|---|---|
| Definition | Alternative form of sick (“cool, excellent”). | A breast wall; window breast; horizontal brink which forms the base of a window. |
Letter map: sik vs sill
Shared letters muted; letters that set sik and sill apart highlighted. Shared run: 2. sik runs 3 letters (CVC) against sill's 4 (CVCC) - the length gap alone is often enough to separate them once you know to check it.
Role in the sentence - sik and sill
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: sik is anadjective and sillanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 69979, derived from the frequency rank of both members and their visual similarity.
sik is recorded at frequency rank #40,893, classified as anadj. sill is at rank #29,086, tagged as anoun, pronounced /sɪl/.
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 69979, this pair ranks #52,388 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of sik vs sill
Shared letters: is. Private to "sik": k. Private to "sill": l.
"sik" · 3 letters · shape CVC · "sill" · 4 letters · shape CVCC
Known mistypes of this pair
- sill ← isll · slil · ssill
Frequently Asked Questions
Is swapping "sik" for "sill" ever safe?
In ordinary English text, does "sik" or "sill" show up more?
Useful next steps
You've compared "sik" and "sill". Here's where to go from here.
- Full dictionary entry for "sik" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "sill" - compare definitions side by side with the headword page. Word entry
- This pair ranks #52,388 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "sik" and "sill" also get mixed up with nearby pairs, the highest-scored neighbour is "Sif vs sik". 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 #52,388 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.