Rome vs Roman Catholic

Rome and Roman Catholic both are nouns.

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

Rome (noun)	Roman Catholic (noun)
the leadership of the Roman Catholic Church	the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy
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 member of the Roman Catholic Church

Rome (adjective)	Roman Catholic (adjective)
	of or relating to or supporting Romanism