nuclear chemist vs chemist

nuclear chemist and chemist both are nouns.

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

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

nuclear chemist (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