Potentate

po'-ten-tat (dunastes, "mighty one," from dunamai, "to be able"): A person who possesses great power and authority. Only in 1Ti 6:15, "the blessed and only Potentate" (= God). The same Greek word is used of Zeus in Sophocles (Ant. 608), and of God in Apocrypha (e.g. Sirach 46:5; 2 Macc 15:3,13). It is used of men in Lu 1:52 (the King James Version "the mighty," the Revised Version (British and American) "princes") and Ac 8:27 ("of great authority").

⇒See the definition of potentate in the KJV Dictionary