# radium vs radius

> English confusable word pair

## The two words

### radium
*noun · IPA /ˈɹeɪ.dɪ.əm/ · frequency rank #37,184*
The chemical element (symbol Ra) with an atomic number of 88. It is a soft, shiny and silvery radioactive alkaline earth metal.

### radius
*noun · IPA /ˈɹeɪ.di.əs/ · frequency rank #8,847*
The long bone in the forearm, on the side of the thumb.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/vs/radium-vs-radius