Church of Rome vs ostensorium

Church of Rome and ostensorium both are nouns.

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

Church of Rome (noun)	ostensorium (noun)
the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy	(Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration