Which to use
“radial” is an adjective and “radius” is a noun - they look or sound alike but fill different roles in a sentence.
- #16,104
- “radial” frequency rank
- #8,847
- “radius” frequency rank
- 24951
- confusion score
Side-by-Side Comparison
| Feature | radial | radius |
|---|---|---|
| Definition | Arranged like rays that radiate from, or converge to, a common centre. | The long bone in the forearm, on the side of the thumb. |
Where the eye mixes radial and radius
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Visual trap between radial and radius
These two trip readers on the page rather than in the ear: radial is /ˈɹeɪdi.əl/ while radius is /ˈɹeɪ.di.əs/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 24951, derived from the frequency rank of both members and their visual similarity.
radial is recorded at frequency rank #16,104, classified as anadj, pronounced /ˈɹeɪdi.əl/. radius is at rank #8,847, tagged as anoun, pronounced /ˈɹeɪ.di.əs/.
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 24951, this pair ranks #398,049 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of radial vs radius
Shared letters: adir. Private to "radial": l. Private to "radius": su.
"radial" · 6 letters · shape CVCVVC · "radius" · 6 letters · shape CVCVVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "radial" for "radius" ever safe?
In ordinary English text, does "radial" or "radius" show up more?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "radial" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "radius" - compare definitions side by side with the headword page. Word entry
- This pair ranks #398,049 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "radial" and "radius" also get mixed up with nearby pairs, the highest-scored neighbour is "radial vs Randal". 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 #398,049 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.