- Satan, Old Nick, Devil, the Devil, Lucifer, Beelzebub, the Tempter, Prince of Darkness - (Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell
--1 is a kind of spiritual being, supernatural being
- the devil - something difficult or awkward to do or deal with; "it will be the devil to solve"
--2 is a kind of trouble, difficulty