capital of Italy vs Roman

capital of Italy and Roman both are nouns.

Word	Noun	Adjective	Verb	Adverb
capital of Italy	Yes	No	No	No
Roman	Yes	Yes	No	No

capital of Italy (noun)	Roman (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 resident of modern Rome
	an inhabitant of the ancient Roman Empire

capital of Italy (adjective)	Roman (adjective)
	of or relating to or supporting Romanism
	of or relating to or derived from Rome (especially ancient Rome)
	characteristic of the modern type that most directly represents the type used in ancient Roman inscriptions