national leader vs Gaius Octavianus

national leader and Gaius Octavianus both are nouns.

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

national leader (noun)	Gaius 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)