The term 'Night Greek Goddess of' can be completed with two answers: Hecate (6 letters) and Nyx (3 letters). Hecate is a goddess in Greek mythology associated with magic, crossroads, and the underworld. She is often depicted as having three heads or three forms. Nyx is the primordial goddess of the night in Greek mythology. She is the daughter of Chaos and is often seen as a symbol of darkness and night.