Church of Rome vs Western Church

Church of Rome and Western Church both are nouns.

Word	Noun	Adjective	Verb	Adverb
Church of Rome	Yes	No	No	No
Western Church	Yes	No	No	No

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

Church of Rome and Western Church: 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, Roman Catholic Church, Roman Church.

Church of Rome (noun)	Western 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