Richard J. Roberts vs chemist

Richard J. Roberts and chemist both are nouns.

Word	Noun	Adjective	Verb	Adverb
Richard J. Roberts	Yes	No	No	No
chemist	Yes	No	No	No

Richard J. Roberts (noun)	chemist (noun)
United States biochemist (born in England) honored for his discovery that some genes contain introns (born in 1943)	a scientist who specializes in chemistry
	a health professional trained in the art of preparing and dispensing drugs