Little Office vs Church of Rome

Little Office and Church of Rome both are nouns.

Word	Noun	Adjective	Verb	Adverb
Little Office	Yes	No	No	No
Church of Rome	Yes	No	No	No

Little Office (noun)	Church of Rome (noun)
a Roman Catholic office honoring the Virgin Mary; similar to but shorter than the Divine Office	the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy