Rome vs Italian Republic

Rome and Italian Republic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rome	Yes	No	No	No
Italian Republic	Yes	No	No	No

Rome (noun)	Italian Republic (noun)
the leadership of the Roman Catholic Church	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
capital and largest city of Italy; on the Tiber; seat of the Roman Catholic Church; formerly the capital of the Roman Republic and the Roman Empire