St. Irenaeus vs Irenaeus

St. Irenaeus and Irenaeus both are nouns.

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

As nouns, St. Irenaeus and Irenaeus are synonyms defined as:

St. Irenaeus and Irenaeus: Greek theologian who was bishop of Lyons and an antiheretical writer; a saint and Doctor of the Church (circa 130-200)

Other synonyms of St. Irenaeus include Saint Irenaeus.

St. Irenaeus (noun)	Irenaeus (noun)
Greek theologian who was bishop of Lyons and an antiheretical writer; a saint and Doctor of the Church (circa 130-200)	Greek theologian who was bishop of Lyons and an antiheretical writer; a saint and Doctor of the Church (circa 130-200)