| heliometer | |
| initiative(noun, vigor, liveliness, vitality, get-up-and-go) | |
| intensity(noun, vigor, liveliness, vitality, get-up-and-go) | |
| interferometer | |
| irradiation | |
| isotopes | |
| job | |
| landmark | |
| lawsuit | |
| life(noun, vigor, liveliness, vitality, get-up-and-go) | |
| limit | |
| lunar caustic(expression, idiom, calefaction) | |
| marigraph | |
| mass spectrophotometermolecular mass(expression, idiom, measurement) | |
| might(noun, vigor, liveliness, vitality, get-up-and-go) | |
| movement | |
| moxa | |
| moxie(noun, vigor, liveliness, vitality, get-up-and-go) | |
| muscle(noun, vigor, liveliness, vitality, get-up-and-go) | |
| natural action(expression, idiom) |
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| APA | Smart Define. (2015). radioactivity thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/radioactivity/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "radioactivity thesaurus" https://smartdefine.org/radioactivity/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, radioactivity thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/radioactivity/thesaurus/synonyms>. |
| MLA | Smart Define. "radioactivity thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/radioactivity/thesaurus/synonyms> |