saint vs St. Gregory I

saint and St. Gregory I both are nouns.

Word	Noun	Adjective	Verb	Adverb
saint	Yes	No	Yes	No
St. Gregory I	Yes	No	No	No

saint (noun)	St. Gregory I (noun)
person of exceptional holiness	(Roman Catholic Church) an Italian pope distinguished for his spiritual and temporal leadership; a saint and Doctor of the Church (540?-604)
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)	St. Gregory I (verb)
declare (a dead person) to be a saint
hold sacred