St. Luke vs Saint Luke

St. Luke and Saint Luke both are nouns.

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

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

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

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

St. Luke (noun)	Saint 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