Which to use
“radio” and “radium” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #1,059
- “radio” frequency rank
- #37,184
- “radium” frequency rank
- 38243
- confusion score
Side-by-Side Comparison
| Feature | radio | radium |
|---|---|---|
| Definition | The technology that allows for the transmission of sound or other signals by modulation of electromagnetic waves. | The chemical element (symbol Ra) with an atomic number of 88. It is a soft, shiny and silvery radioactive alkaline earth metal. |
Where the eye mixes radio and radium
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. radio runs 5 letters (CVCVV) against radium's 6 (CVCVVC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses radio with radium
A purely visual mix-up. radio (/ˈɹeɪdiˌəʊ/) and radium (/ˈɹeɪ.dɪ.əm/) 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 38243, derived from the frequency rank of both members and their visual similarity.
radio is recorded at frequency rank #1,059, classified as anoun, pronounced /ˈɹeɪdiˌəʊ/. radium is at rank #37,184, tagged as anoun, pronounced /ˈɹeɪ.dɪ.əm/.
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 38243, this pair ranks #287,651 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of radio vs radium
Shared letters: adir. Private to "radio": o. Private to "radium": mu.
"radio" · 5 letters · shape CVCVV · "radium" · 6 letters · shape CVCVVC
Known mistypes of this pair
Frequently Asked Questions
Can "radio" and "radium" be used interchangeably?
Which is more common, "radio" or "radium"?
After this comparison
Eye-level mix-up between "radio" and "radium" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "radio" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "radium" - compare definitions side by side with the headword page. Word entry
- This pair ranks #287,651 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "radio" and "radium" also get mixed up with nearby pairs, the highest-scored neighbour is "radium vs Rahim". 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 #287,651 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.