Devil
supernatural entity that is a personification of evil and enemy of a god or gods and/or humankind / From Wikipedia, the free encyclopedia
In some religions and mythology, the Devil is an evil spirit, demon or supernatural being that tries to create problems for people and distance them from God. In some cultures, the Devil seen as the embodiment of evil. He is characterised by his red skin, horns and tail.
Some people also use the word "Satan" for the most powerful devil.