good spirit vs guardian spirit

good spirit and guardian spirit both are nouns.

Word	Noun	Adjective	Verb	Adverb
good spirit	Yes	No	No	No
guardian spirit	Yes	No	No	No

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

good spirit: a benevolent spirit
guardian spirit: an angel believed to have special affection for a particular individual

Other hypernyms of good spirit include guardian angel.

good spirit (noun)	guardian spirit (noun)
a benevolent spirit	an angel believed to have special affection for a particular individual