Saint Matthew vs St. Matthew

Saint Matthew and St. Matthew both are nouns.

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

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

Saint Matthew and St. Matthew: (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 the Apostle.

Saint Matthew (noun)	St. Matthew (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