Bellerophon Horse is a term used to refer to three mythical creatures from Greek mythology: Pegasus (7 letters), CHIMERA (7 letters) and NAG (3 letters). Pegasus is a winged horse, CHIMERA is a fire-breathing monster with the head of a lion, the body of a goat and the tail of a serpent, and NAG is a horse-like creature with a human face. All three of these creatures were ridden by Bellerophon, a hero in Greek mythology.