Wahyu 9:11

9:11 They have as king over them the angel of the abyss, whose name in Hebrew is Abaddon, and in Greek, Apollyon. ¹ 

Wahyu 9:19

9:19 For the power ²  of the horses resides ³  in their mouths and in their tails, because their tails are like snakes, having heads that inflict injuries.

[9:11]  ¹ sn Both the Hebrew Abaddon and the Greek Apollyon mean “Destroyer.”

[9:19]  ² tn See BDAG 352 s.v. ἐξουσία 2, “potential or resource to command, control, or govern, capability, might, power.”

[9:19]  ³ tn Grk “is.”