national leader vs Charles Grey

national leader and Charles Grey both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
Charles Grey	Yes	No	No	No

national leader (noun)	Charles Grey (noun)
a person who is a respected leader in national or international affairs	Englishman who as Prime Minister implemented social reforms including the abolition of slavery throughout the British Empire (1764-1845)