genius vs intellectual

genius and intellectual both are nouns.

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

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

Other hypernyms of genius include intellect.

genius (noun)	intellectual (noun)
exceptional creative ability	a person who uses the mind creatively
a natural talent
unusual mental ability
someone who has exceptional intellectual ability and originality
someone who is dazzlingly skilled in any field

genius (adjective)	intellectual (adjective)
	appealing to or using the intellect
	involving intelligence rather than emotions or instinct
	of or associated with or requiring the use of the mind