saint vs Saint Luke

saint and Saint Luke both are nouns.

Word	Noun	Adjective	Verb	Adverb
saint	Yes	No	Yes	No
Saint Luke	Yes	No	No	No

saint (noun)	Saint Luke (noun)
person of exceptional holiness	(New Testament) the Apostle closely associated with St. Paul and traditionally assumed to be the author of the third Gospel
model of excellence or perfection of a kind; one having no equal
a person who has died and has been declared a saint by canonization

saint (verb)	Saint Luke (verb)
declare (a dead person) to be a saint
hold sacred