Roman Church vs St. Irenaeus

Roman Church and St. Irenaeus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman Church	Yes	No	No	No
St. Irenaeus	Yes	No	No	No

Roman Church (noun)	St. Irenaeus (noun)
the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy	Greek theologian who was bishop of Lyons and an antiheretical writer; a saint and Doctor of the Church (circa 130-200)