national leader vs Seneca the Younger

national leader and Seneca the Younger both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
Seneca the Younger	Yes	No	No	No

national leader (noun)	Seneca the Younger (noun)
a person who is a respected leader in national or international affairs	Roman statesman and philosopher who was an advisor to Nero; his nine extant tragedies are modeled on Greek tragedies (circa 4 BC - 65 AD)