Which to use
“radius” and “rails” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #8,847
- “radius” frequency rank
- #9,804
- “rails” frequency rank
- 18651
- confusion score
Side-by-Side Comparison
| Feature | radius | rails |
|---|---|---|
| Definition | The long bone in the forearm, on the side of the thumb. | plural of rail |
Where the eye mixes radius and rails
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Visual trap between radius and rails
A purely visual mix-up. radius (/ˈɹeɪ.di.əs/) and rails (/ɹeɪlz/) 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 18651, derived from the frequency rank of both members and their visual similarity.
radius is recorded at frequency rank #8,847, classified as anoun, pronounced /ˈɹeɪ.di.əs/. rails is at rank #9,804, tagged as anoun, pronounced /ɹeɪlz/.
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 18651, this pair ranks #443,460 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of radius vs rails
Shared letters: airs. Private to "radius": du. Private to "rails": l.
"radius" · 6 letters · shape CVCVVC · "rails" · 5 letters · shape CVVCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "radius" for "rails" ever safe?
Frequency check: "radius" vs "rails" - which ranks higher?
After this comparison
Eye-level mix-up between "radius" and "rails" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "radius" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "rails" - compare definitions side by side with the headword page. Word entry
- This pair ranks #443,460 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "radius" and "rails" also get mixed up with nearby pairs, the highest-scored neighbour is "rails vs reis". 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 #443,460 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.