national leader vs Viscount St. Albans

national leader and Viscount St. Albans both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
Viscount St. Albans	Yes	No	No	No

national leader (noun)	Viscount St. Albans (noun)
a person who is a respected leader in national or international affairs	English statesman and philosopher; precursor of British empiricism; advocated inductive reasoning (1561-1626)