Revelation 9:11
From Textus Receptus
Revelation 9:11 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.
In the King James Version of 1611, it has a footnote at the word Apollyon which says:
"That is to say A destroyer".