Which to use
“cask” is a noun and “cis” is an adjective - they look or sound alike but fill different roles in a sentence.
- #29,208
- “cask” frequency rank
- #13,115
- “cis” frequency rank
- 42323
- confusion score
Side-by-Side Comparison
| Feature | cask | cis |
|---|---|---|
| Definition | A large barrel for the storage of liquid, especially of alcoholic drinks. (See a diagram of cask sizes.) | Having two mutations on two genes on the same chromosome of a homologous pair. |
Where the eye mixes cask and cis
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses cask with cis
These two trip readers on the page rather than in the ear: cask is /kɑːsk/ while cis is /sɪs/. 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 (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 42323, derived from the frequency rank of both members and their visual similarity.
cask is recorded at frequency rank #29,208, classified as anoun, pronounced /kɑːsk/. cis is at rank #13,115, tagged as anadj, pronounced /sɪs/.
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 42323, this pair ranks #250,277 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of cask vs cis
Shared letters: cs. Private to "cask": ak. Private to "cis": i.
"cask" · 4 letters · shape CVCC · "cis" · 3 letters · shape CVC
Known mistypes of this pair
- cask ← acsk · caks · caskk · cassk · ccask · csak
Frequently Asked Questions
Can "cask" and "cis" be used interchangeably?
In ordinary English text, does "cask" or "cis" show up more?
Useful next steps
Eye-level mix-up between "cask" and "cis" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "cask" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "cis" - compare definitions side by side with the headword page. Word entry
- This pair ranks #250,277 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "cask" and "cis" also get mixed up with nearby pairs, the highest-scored neighbour is "cask vs CSX". 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 #250,277 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.