fairy godmother vs benefactor

fairy godmother and benefactor both are nouns.

Word	Noun	Adjective	Verb	Adverb
fairy godmother	Yes	No	No	No
benefactor	Yes	No	No	No

As nouns, benefactor is a hypernym of fairy godmother; that is, benefactor is a word with a broader meaning than fairy godmother:

fairy godmother: a generous benefactor
benefactor: a person who helps people or institutions (especially with financial help)

Other hypernyms of fairy godmother include helper.

fairy godmother (noun)	benefactor (noun)
a female character in some fairy stories who has magical powers and can bring unexpected good fortune to the hero or heroine	a person who helps people or institutions (especially with financial help)
a generous benefactor