archfiend

noun

A chief fiend
Satan
(transferred sense) A diabolically evil person.

Similar Words

arc /ɑːk/ arcade /ɑːˈkeɪd/ arcane /ɑɹˈkeɪn/ arced /ɑːkt/ arch /ɑːt͡ʃ/ archaeologists archaised archaises archaising archaisms