nuclear physicist vs Heisenberg

nuclear physicist and Heisenberg both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear physicist	Yes	No	No	No
Heisenberg	Yes	No	No	No

nuclear physicist (noun)	Heisenberg (noun)
a physicist who specializes in nuclear physics	German mathematical physicist noted for stating the uncertainty principle (1901-1976)