Nouns

(n)intellectual, intellecta person who uses the mind creatively

Adjectives

(s)intellectual, rational, noeticof or associated with or requiring the use of the mind“intellectual problems”, “the triumph of the rational over the animal side of man”
(a)intellectualappealing to or using the intellect“satire is an intellectual weapon”, “intellectual workers engaged in creative literary or artistic or scientific labor”, “has tremendous intellectual sympathy for oppressed people”, “coldly intellectual”, “sort of the intellectual type”, “intellectual literature”
(a)cerebral, intellectualinvolving intelligence rather than emotions or instinct“a cerebral approach to the problem”, “cerebral drama”