national leader vs Lucius Annaeus Seneca

national leader and Lucius Annaeus Seneca both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
Lucius Annaeus Seneca	Yes	No	No	No

national leader (noun)	Lucius Annaeus Seneca (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)