'King' in the Bible

They have as king over them, the angel of the abyss (the bottomless pit); in Hebrew his name is Abaddon (destruction), and in Greek he is called Apollyon (destroyer-king).

And they sang the song of Moses, the bond-servant of God, and the song of the Lamb, saying,“Great and wonderful and awe-inspiring are Your works [in judgment],O Lord God, the Almighty [the Omnipotent, the Ruler of all];Righteous and true are Your ways,O King of the nations!

And the beast that [once] was but is not, is himself also an eighth king and is one of the seven, and he goes to destruction (perdition).

They will wage war against the Lamb (Christ), and the Lamb will triumph and conquer them, because He is Lord of lords and King of kings, and those who are with Him and on His side are the called and chosen (elect) and faithful.”

And on His robe and on His thigh He has a name inscribed, “KING OF KINGS, AND LORD OF LORDS.”