radiochemist vs chemist

radiochemist and chemist both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiochemist	Yes	No	No	No
chemist	Yes	No	No	No

As nouns, chemist is a hypernym of radiochemist; that is, chemist is a word with a broader meaning than radiochemist:

radiochemist (noun)	chemist (noun)
a chemist who specializes in nuclear chemistry	a scientist who specializes in chemistry
	a health professional trained in the art of preparing and dispensing drugs