John the Evangelist vs St. John the Apostle

John the Evangelist and St. John the Apostle both are nouns.

Word	Noun	Adjective	Verb	Adverb
John the Evangelist	Yes	No	No	No
St. John the Apostle	Yes	No	No	No

As nouns, John the Evangelist and St. John the Apostle are synonyms defined as:

John the Evangelist and St. John the Apostle: (New Testament) disciple of Jesus; traditionally said to be the author of the 4th Gospel and three epistles and the book of Revelation

Other synonyms of John the Evangelist include John, John the Divine, Saint John, Saint John the Apostle, St. John.

John the Evangelist (noun)	St. John the Apostle (noun)
(New Testament) disciple of Jesus; traditionally said to be the author of the 4th Gospel and three epistles and the book of Revelation	(New Testament) disciple of Jesus; traditionally said to be the author of the 4th Gospel and three epistles and the book of Revelation