Rome vs Roman

Rome and Roman both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rome	Yes	No	No	No
Roman	Yes	Yes	No	No

Rome (noun)	Roman (noun)
the leadership of the Roman Catholic Church	a resident of modern Rome
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	an inhabitant of the ancient Roman Empire

Rome (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