The term 'Parts of the Psyche' refers to the three components of Sigmund Freud's psychoanalytic theory of personality. These components are the Ego (4 letters), Id (3 letters) and Superego (8 letters). The Ego is the conscious part of the psyche that mediates between the demands of the Id and the Superego. The Id is the unconscious part of the psyche that is driven by instinctual needs and desires. The Superego is the moral component of the psyche that is responsible for our sense of right and wrong. Together, these three parts of the psyche form the basis of Freud's psychoanalytic theory of personality.