Luke the Evangelist vs St. Luke

Luke the Evangelist and St. Luke both are nouns.

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

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

Luke the Evangelist and St. Luke: (New Testament) the Apostle closely associated with St. Paul and traditionally assumed to be the author of the third Gospel

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

Luke the Evangelist (noun)	St. Luke (noun)
(New Testament) the Apostle closely associated with St. Paul and traditionally assumed to be the author of the third Gospel	(New Testament) the Apostle closely associated with St. Paul and traditionally assumed to be the author of the third Gospel