The term 'winged monster of Greek myth' can be summarized by the word 'HARPY, ' which is a five-letter word. In Greek mythology, Harpies were female monsters with wings and claws. They were often depicted as having the body of a bird and the face of a woman. Harpies were known for their swiftness and strength, and they were said to be the personification of storm winds. They were also known for stealing food from mortals.