mastermind vs intellect

mastermind and intellect both are nouns.

Word	Noun	Adjective	Verb	Adverb
mastermind	Yes	No	Yes	No
intellect	Yes	No	No	No

As nouns, intellect is a hypernym of mastermind; that is, intellect is a word with a broader meaning than mastermind:

mastermind: someone who has exceptional intellectual ability and originality
intellect: a person who uses the mind creatively

Other hypernyms of mastermind include intellectual.

mastermind (noun)	intellect (noun)
someone who creates new things	the capacity for rational thought or inference or discrimination
someone who has exceptional intellectual ability and originality	knowledge and intellectual ability
	a person who uses the mind creatively

mastermind (verb)	intellect (verb)
plan and direct (a complex undertaking)