Saint Matthew vs St. Matthew the Apostle

Saint Matthew and St. Matthew the Apostle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Matthew	Yes	No	No	No
St. Matthew the Apostle	Yes	No	No	No

As nouns, Saint Matthew and St. Matthew the Apostle are synonyms defined as:

Saint Matthew and St. Matthew the Apostle: (New Testament) disciple of Jesus; traditionally considered to be the author of the first Gospel

Other synonyms of Saint Matthew include Levi, Matthew, Saint Matthew the Apostle, St. Matthew.

Saint Matthew (noun)	St. Matthew the Apostle (noun)
(New Testament) disciple of Jesus; traditionally considered to be the author of the first Gospel	(New Testament) disciple of Jesus; traditionally considered to be the author of the first Gospel