chemist vs Joseph Black

chemist and Joseph Black both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Joseph Black	Yes	No	No	No

chemist (noun)	Joseph Black (noun)
a scientist who specializes in chemistry	British chemist who identified carbon dioxide and who formulated the concepts of specific heat and latent heat (1728-1799)
a health professional trained in the art of preparing and dispensing drugs