national leader vs William of Wykeham

national leader and William of Wykeham both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
William of Wykeham	Yes	No	No	No

national leader (noun)	William of Wykeham (noun)
a person who is a respected leader in national or international affairs	English prelate and statesman; founded a college at Oxford and Winchester College in Winchester; served as chancellor of England and bishop of Winchester (1320-1404)