Church of Rome vs Roman Catholic

Church of Rome and Roman Catholic both are nouns.

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

As nouns, Church of Rome and Roman Catholic are synonyms defined as:

Church of Rome and Roman Catholic: the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy

Other synonyms of Church of Rome include Roman Catholic Church, Roman Church, Western Church.

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

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