Saint Luke vs saint

Saint Luke and saint both are nouns.

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

Saint Luke (noun)	saint (noun)
(New Testament) the Apostle closely associated with St. Paul and traditionally assumed to be the author of the third Gospel	person of exceptional holiness
	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 Luke (verb)	saint (verb)
	declare (a dead person) to be a saint
	hold sacred