national leader vs Arthur Wellesley

national leader and Arthur Wellesley both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
Arthur Wellesley	Yes	No	No	No

national leader (noun)	Arthur Wellesley (noun)
a person who is a respected leader in national or international affairs	British general and statesman; he defeated Napoleon at Waterloo; subsequently served as Prime Minister (1769-1852)