Mark the Evangelist vs St. Mark

Mark the Evangelist and St. Mark both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mark the Evangelist	Yes	No	No	No
St. Mark	Yes	No	No	No

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

Mark the Evangelist and St. Mark: Apostle and companion of Saint Peter; assumed to be the author of the second Gospel

Other synonyms of Mark the Evangelist include Mark, Saint Mark.

Mark the Evangelist (noun)	St. Mark (noun)
Apostle and companion of Saint Peter; assumed to be the author of the second Gospel	Apostle and companion of Saint Peter; assumed to be the author of the second Gospel