Mental
Part of speech: adjective
Definition: of or relating to the mind or an intellectual process of or relating to the chin or median part of the lower jaw, genial of or relating to the chin-like or lip-like structure of or pertaining to a crazy person, crazy
Intellectual
Part of speech: adjective
Definition: Belonging to, or performed by, the intellect; mental; as, intellectual powers, activities, etc.Endowed with intellect; having the power of understanding; having capacity for the higher forms of knowledge or thought; characterized by intelligence or mental capacity; as, an intellectual person.Suitable for exercising the intellect; formed by, and existing for, the intellect alone; perceived by the intellect; as, intellectual employments.Relating to the understanding; treating of the mind; as, intellectual philosophy, sometimes called "mental" philosophy.
Part of speech: noun
Definition: An intelligent person, someone interested in intellectual matters.The intellect or understanding; mental powers or faculties.