Noun

(en noun)

A person who gathers nuts.

(informal) An eccentric, insane, crazy or reckless person.

A person who is obsessed with something.

Noun

(en-noun)

(eulogistic) Someone possessing extraordinary intelligence or skill; especially somebody who has demonstrated this by a creative or original work in science, music, art etc.

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, title=(The Celebrity), chapter=1 , passage=In the old days, to my commonplace and unobserving mind, he gave no evidences of genius whatsoever. He never read me any of his manuscripts, […], and therefore my lack of detection of his promise may in some degree be pardoned.}}

Extraordinary mental capacity.

Inspiration, a mental leap, an extraordinary creative process.

(Roman mythology) The guardian spirit of a place or person.

A way of thinking, optimizing one's capacity for learning and understanding.