national leader vs Rockingham

national leader and Rockingham both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
Rockingham	Yes	No	No	No

national leader (noun)	Rockingham (noun)
a person who is a respected leader in national or international affairs	English statesman who served as prime minister and who opposed the war with the American colonies (1730-1782)