The term 'God of the Underworld' refers to four different gods from various mythologies. PLUTO, with five letters, is the Roman god of the underworld, and HADES, also with five letters, is the Greek god of the underworld. DIS, with three letters, is an Etruscan god of the underworld, and Osiris, with six letters, is an Egyptian god of the underworld. All four gods are associated with death, the afterlife, and the underworld.