Which to use
“sick” is an adjective and “sickle” is a noun - they look or sound alike but fill different roles in a sentence.
- #1,410
- “sick” frequency rank
- #23,996
- “sickle” frequency rank
- 25406
- confusion score
Side-by-Side Comparison
| Feature | sick | sickle |
|---|---|---|
| Definition | In poor health; ill. | An implement having a semicircular blade and short handle, used for cutting long grass and cereal crops. |
Where the eye mixes sick and sickle
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. sick runs 4 letters (CVCC) against sickle's 6 (CVCCCV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses sick with sickle
These two trip readers on the page rather than in the ear: sick is /ˈsɪk/ while sickle is /ˈsɪkl̩/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “sick” sits inside “sickle”, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 25406, derived from the frequency rank of both members and their visual similarity.
sick is recorded at frequency rank #1,410, classified as anadj, pronounced /ˈsɪk/. sickle is at rank #23,996, tagged as anoun, pronounced /ˈsɪkl̩/.
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 25406, this pair ranks #394,505 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of sick vs sickle
Shared letters: ciks. Private to "sick": -. Private to "sickle": el.
"sick" · 4 letters · shape CVCC · "sickle" · 6 letters · shape CVCCCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "sick" for "sickle" ever safe?
In ordinary English text, does "sick" or "sickle" show up more?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "sick" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "sickle" - compare definitions side by side with the headword page. Word entry
- This pair ranks #394,505 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "sick" and "sickle" also get mixed up with nearby pairs, the highest-scored neighbour is "shackle vs sickle". 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 #394,505 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.