| radium | |
| radon | |
| rays(noun, strength, vigor, heat, service) | |
| reaction(noun, strength, vigor, heat, service) | |
| response(noun, strength, vigor, heat, service) | |
| saturation point | |
| service(noun, strength, vigor, heat, liveliness) | |
| specific activity | |
| steam(noun, strength, vigor, heat, service) | |
| strength(noun, vigor, heat, service, liveliness) | |
| thermoelectricity | |
| tritium | |
| uranium | |
| voltage(noun, strength, vigor, heat, service) | |
| wattage(noun, strength, vigor, heat, service) | |
| élan(vigor, liveliness, vitality, get-up-and-go, oomph) | |
| Roentgen rays | |
| X ray(noun, picture) | |
| accomplishment | |
| achievement |
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| APA | Smart Define. (2015). radioactivity thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/radioactivity/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "radioactivity thesaurus" https://smartdefine.org/radioactivity/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, radioactivity thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/radioactivity/thesaurus/synonyms>. |
| MLA | Smart Define. "radioactivity thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/radioactivity/thesaurus/synonyms> |