Saint Mark vs saint

Saint Mark and saint both are nouns.

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

Saint Mark (noun)	saint (noun)
Apostle and companion of Saint Peter; assumed to be the author of the second 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 Mark (verb)	saint (verb)
	declare (a dead person) to be a saint
	hold sacred