Gospel of John vs Gospel According to John

Gospel of John and Gospel According to John both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gospel of John	Yes	No	No	No
Gospel According to John	Yes	No	No	No

As nouns, Gospel of John and Gospel According to John are synonyms defined as:

Gospel of John and Gospel According to John: the last of the four Gospels in the New Testament

Other synonyms of Gospel of John include John.

Gospel of John (noun)	Gospel According to John (noun)
the last of the four Gospels in the New Testament	the last of the four Gospels in the New Testament