patron saint vs guardian

patron saint and guardian both are nouns.

Word	Noun	Adjective	Verb	Adverb
patron saint	Yes	No	No	No
guardian	Yes	No	No	No

As nouns, guardian is a hypernym of patron saint; that is, guardian is a word with a broader meaning than patron saint:

patron saint: a saint who is considered to be a defender of some group or nation
guardian: a person who cares for persons or property

Other hypernyms of patron saint include defender, protector, shielder, saint.

patron saint (noun)	guardian (noun)
a saint who is considered to be a defender of some group or nation	a person who cares for persons or property