national leader vs Gaius Julius Caesar Octavianus

national leader and Gaius Julius Caesar Octavianus both are nouns.

Word	Noun	Adjective	Verb	Adverb
national leader	Yes	No	No	No
Gaius Julius Caesar Octavianus	Yes	No	No	No

national leader (noun)	Gaius Julius Caesar Octavianus (noun)
a person who is a respected leader in national or international affairs	Roman statesman who established the Roman Empire and became emperor in 27 BC; defeated Mark Antony and Cleopatra in 31 BC at Actium (63 BC - AD 14)