Roma vs Italian Republic

Roma and Italian Republic both are nouns.

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

Roma (noun)	Italian Republic (noun)
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	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
a member of a people with dark skin and hair who speak Romany and who traditionally live by seasonal work and fortunetelling; they are believed to have originated in northern India but now are living on all continents (but mostly in Europe, North Africa, and North America)