cognition, knowledge, noesis - the psychological result of perception and learning and reasoning

noddle - an informal British expression for head or mind; "use your noddle"

tabula rasa - a young mind not yet affected by experience (according to John Locke)

ego - (psychoanalysis) the conscious mind

unconscious, unconscious mind - that part of the mind wherein psychic activity takes place of which the person is unaware

subconscious, subconscious mind - psychic activity just below the level of awareness

ghost - the visible disembodied soul of a dead person

spirit - the vital principle or animating force within living things

Greek mythology - the mythology of the ancient Greeks

mythical being - an imaginary being of myth or fable