nuclear physicist vs Andrei Sakharov

nuclear physicist and Andrei Sakharov both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear physicist	Yes	No	No	No
Andrei Sakharov	Yes	No	No	No

nuclear physicist (noun)	Andrei Sakharov (noun)
a physicist who specializes in nuclear physics	Soviet physicist and dissident; helped develop the first Russian hydrogen bomb; advocated nuclear disarmament and campaigned for human rights (1921-1989)