chemist vs Richard Kuhn

chemist and Richard Kuhn both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Richard Kuhn	Yes	No	No	No

chemist (noun)	Richard Kuhn (noun)
a scientist who specializes in chemistry	Austrian chemist who did research on carotenoids and vitamins (1900-1967)
a health professional trained in the art of preparing and dispensing drugs