Roman Catholic Church vs Roman Church

Roman Catholic Church and Roman Church both are nouns.

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

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

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

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

Roman Catholic Church (noun)	Roman Church (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