And they have over them a king — One by whom they are peculiarly directed and governed. His name is Abaddon — Both this and Apollyon signify a destroyer. By this he is distinguished from the dragon, whose proper name is Satan.
Related Commentaries of Revelation 9:11
Revelation 9:11
11 And they had a king over them, which is the angel of the bottomless pit, whose name in the Hebrew tongue is Abaddon, but in the Greek tongue hath his name Apollyon.a