魔王

Noun

 * 1)  devil king
 * 2)  very evil person; fiend

Noun

 * 1)  the devil, devil king
 * 2) archenemy
 * 3)  leader of the underworld; dark lord
 * °N, °W

Usage notes
Despite the term containing, a is not necessarily male. can also refer to female demonic leaders.