Church of Rome vs Doctor of the Church

Church of Rome and Doctor of the Church both are nouns.

Word	Noun	Adjective	Verb	Adverb
Church of Rome	Yes	No	No	No
Doctor of the Church	Yes	No	No	No

Church of Rome (noun)	Doctor of the Church (noun)
the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy	(Roman Catholic Church) a title conferred on 33 saints who distinguished themselves through the orthodoxy of their theological teaching