director vs Serge Koussevitzky

director and Serge Koussevitzky both are nouns.

Word	Noun	Adjective	Verb	Adverb
director	Yes	No	No	No
Serge Koussevitzky	Yes	No	No	No

director (noun)	Serge Koussevitzky (noun)
someone who controls resources and expenditures	United States conductor (born in Russia) who was noted for performing the works of contemporary composers (1874-1951)
the person who leads a musical group
someone who supervises the actors and directs the action in the production of a show
member of a board of directors
the person who directs the making of a film