nuclear physicist vs Carl Anderson

nuclear physicist and Carl Anderson both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear physicist	Yes	No	No	No
Carl Anderson	Yes	No	No	No

nuclear physicist (noun)	Carl Anderson (noun)
a physicist who specializes in nuclear physics	United States physicist who discovered antimatter in the form of an antielectron that is called the positron (1905-1991)