chemist vs radiochemist

chemist and radiochemist both are nouns.

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

As nouns, radiochemist is a hyponym of chemist; that is, radiochemist is a word with a more specific, narrower meaning than chemist:

Other hyponyms of chemist include biochemist, nuclear chemist, phytochemist.

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