Which to use
“ruby” is a noun and “run” is a verb - they look or sound alike but fill different roles in a sentence.
- #7,386
- “ruby” frequency rank
- #309
- “run” frequency rank
- 7695
- confusion score
Side-by-Side Comparison
| Feature | ruby | run |
|---|---|---|
| Definition | A clear, deep, red variety of corundum, valued as a precious stone. | To move swiftly. |
Where the eye mixes ruby and run
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between ruby and run
These two trip readers on the page rather than in the ear: ruby is /ˈɹuː.bi/ 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 7695, derived from the frequency rank of both members and their visual similarity.
ruby is recorded at frequency rank #7,386, classified as anoun, pronounced /ˈɹuː.bi/. 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 7695, this pair ranks #505,989 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of ruby vs run
Shared letters: ru. Private to "ruby": by. Private to "run": n.
"ruby" · 4 letters · shape CVCV · "run" · 3 letters · shape CVC
Known mistypes of this pair
- ruby ← rbuy · rruby · rubby · rubyy · ruyb · urby
Frequently Asked Questions
Is swapping "ruby" for "run" ever safe?
Frequency check: "ruby" vs "run" - which ranks higher?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "ruby" 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 #505,989 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "ruby" and "run" also get mixed up with nearby pairs, the highest-scored neighbour is "Rua vs ruby". 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 #505,989 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.