incantation vs magical spell

incantation and magical spell both are nouns.

Word	Noun	Adjective	Verb	Adverb
incantation	Yes	No	No	No
magical spell	Yes	No	No	No

As nouns, magical spell is a hypernym of incantation; that is, magical spell is a word with a broader meaning than incantation:

incantation: a ritual recitation of words or sounds believed to have a magical effect
magical spell: a verbal formula believed to have magical force

Other hypernyms of incantation include charm, magic spell, spell.

incantation (noun)	magical spell (noun)
a ritual recitation of words or sounds believed to have a magical effect	a verbal formula believed to have magical force