genius loci vs guardian angel

genius loci and guardian angel both are nouns.

Word	Noun	Adjective	Verb	Adverb
genius loci	Yes	No	No	No
guardian angel	Yes	No	No	No

As nouns, guardian angel is a hypernym of genius loci; that is, guardian angel is a word with a broader meaning than genius loci:

genius loci: the guardian spirit of a place
guardian angel: an angel believed to have special affection for a particular individual

Other hypernyms of genius loci include guardian spirit.

genius loci (noun)	guardian angel (noun)
the guardian spirit of a place	an angel believed to have special affection for a particular individual
the special atmosphere of a place