genius vs mastermind

genius and mastermind both are nouns.

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

As nouns, genius and mastermind are synonyms defined as:

genius and mastermind: someone who has exceptional intellectual ability and originality

Other synonyms of genius include brain, brainiac, Einstein.

genius (noun)	mastermind (noun)
exceptional creative ability	someone who creates new things
a natural talent	someone who has exceptional intellectual ability and originality
unusual mental ability
someone who has exceptional intellectual ability and originality
someone who is dazzlingly skilled in any field

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