nuclear physicist vs Otto Frisch

nuclear physicist and Otto Frisch both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear physicist	Yes	No	No	No
Otto Frisch	Yes	No	No	No

nuclear physicist (noun)	Otto Frisch (noun)
a physicist who specializes in nuclear physics	British physicist (born in Austria) who with Lise Meitner recognized that Otto Hahn had produced a new kind of nuclear reaction which they named nuclear fission; Frisch described the explosive potential of a chain nuclear reaction (1904-1979)