Po River vs Italian Republic

Po River and Italian Republic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Po River	Yes	No	No	No
Italian Republic	Yes	No	No	No

Po River (noun)	Italian Republic (noun)
a European river; flows into the Adriatic Sea	a republic in southern Europe on the Italian Peninsula; was the core of the Roman Republic and the Roman Empire between the 4th century BC and the 5th century AD