Church of Rome vs ultramontanism

Church of Rome and ultramontanism both are nouns.

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

Church of Rome (noun)	ultramontanism (noun)
the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy	(Roman Catholic Church) the policy that the absolute authority of the church should be vested in the pope