Radon gas, a radioactive gas that naturally occurs in soil and rocks, has several synonyms that refer to the same gas. Some of the synonyms for radon gas include radon-222, Rn-222, and radonium. Other synonyms also refer to the potential health risks associated with radon gas, such as lung cancer gas or carcinogenic gas. Additionally, some synonyms for radon gas may refer to its use in geological dating, such as radon emanation or radon daughter products. Regardless of the synonym used, it is essential to take appropriate measures to detect and mitigate the risks associated with radon gas exposure.