Which to use
“cos” and “cyst” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #6,553
- “cos” frequency rank
- #24,720
- “cyst” frequency rank
- 31273
- confusion score
Side-by-Side Comparison
| Feature | cos | cyst |
|---|---|---|
| Definition | Synonym of romaine lettuce, a long-leaved variety of lettuce. | A pouch or sac without opening, usually membranous and containing morbid matter, which develops in one of the natural cavities or in the substance of an organ. |
Where the eye mixes cos and cyst
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between cos and cyst
A purely visual mix-up. cos (/kɑs/) and cyst (/sɪst/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 31273, derived from the frequency rank of both members and their visual similarity.
cos is recorded at frequency rank #6,553, classified as anoun, pronounced /kɑs/. cyst is at rank #24,720, tagged as anoun, pronounced /sɪst/.
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 31273, this pair ranks #347,516 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of cos vs cyst
Shared letters: cs. Private to "cos": o. Private to "cyst": ty.
"cos" · 3 letters · shape CVC · "cyst" · 4 letters · shape CVCC
Known mistypes of this pair
- cyst ← ccyst · csyt · cysst · cystt · cyts · cyyst · ycst
Frequently Asked Questions
Do "cos" and "cyst" mean the same thing in a sentence?
Frequency check: "cos" vs "cyst" - which ranks higher?
What to do next
Eye-level mix-up between "cos" and "cyst" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "cos" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "cyst" - compare definitions side by side with the headword page. Word entry
- This pair ranks #347,516 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "cos" and "cyst" also get mixed up with nearby pairs, the highest-scored neighbour is "Crist vs cyst". 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 #347,516 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.