chemist vs Willard Frank Libby

chemist and Willard Frank Libby both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Willard Frank Libby	Yes	No	No	No

chemist (noun)	Willard Frank Libby (noun)
a scientist who specializes in chemistry	United States chemist who developed a method of radiocarbon dating (1908-1980)
a health professional trained in the art of preparing and dispensing drugs