national leader vs Charles Watson-Wentworth

national leader and Charles Watson-Wentworth both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
Charles Watson-Wentworth	Yes	No	No	No

national leader (noun)	Charles Watson-Wentworth (noun)
a person who is a respected leader in national or international affairs	English statesman who served as prime minister and who opposed the war with the American colonies (1730-1782)