national leader vs Neville Chamberlain

national leader and Neville Chamberlain both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
Neville Chamberlain	Yes	No	No	No

national leader (noun)	Neville Chamberlain (noun)
a person who is a respected leader in national or international affairs	British statesman who as Prime Minister pursued a policy of appeasement toward fascist Germany (1869-1940)