Gospel According to John vs Gospel of John

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

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

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

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

Other synonyms of Gospel According to John include John.

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