Which to use
“ruff” is a noun and “run” is a verb - they look or sound alike but fill different roles in a sentence.
- #27,272
- “ruff” frequency rank
- #309
- “run” frequency rank
- 27581
- confusion score
Side-by-Side Comparison
| Feature | ruff | run |
|---|---|---|
| Definition | A circular frill or ruffle on a garment, especially a starched, fluted frill at the neck in Elizabethan and Jacobean England (1560s–1620s). | To move swiftly. |
Where the eye mixes ruff and run
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: ruff vs run
These two trip readers on the page rather than in the ear: ruff is /ɹʌf/ while run is /ɹʌn/. 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 verb), which is usually the fastest check. Our composite confusion score for this pair is 27581, derived from the frequency rank of both members and their visual similarity.
ruff is recorded at frequency rank #27,272, classified as anoun, pronounced /ɹʌf/. run is at rank #309, tagged as averb, pronounced /ɹʌn/.
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 27581, this pair ranks #377,808 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of ruff vs run
Shared letters: ru. Private to "ruff": f. Private to "run": n.
"ruff" · 4 letters · shape CVCC · "run" · 3 letters · shape CVC
Known mistypes of this pair
- ruff ← rfuf · rruff · ruf · urff
Frequently Asked Questions
Can "ruff" and "run" be used interchangeably?
Which is more common, "ruff" or "run"?
After this comparison
Eye-level mix-up between "ruff" and "run" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "ruff" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "run" - compare definitions side by side with the headword page. Word entry
- This pair ranks #377,808 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "ruff" and "run" also get mixed up with nearby pairs, the highest-scored neighbour is "Rua vs ruff". 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 #377,808 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.