Strong’s Greek
G1413 — dunastes
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
δυνάστης
dunastes — pronounced doo-nas'-tace
from 1410; a ruler or officer:--of great authority, mighty, potentate. see GREEK for 1410
3 occurrences in the KJV.
Luke 1:52
He hath put down the mighty from their seats, and exalted them of low degree.
Acts 8:27
And he arose and went: and, behold, a man of Ethiopia, an eunuch of great authority under Candace queen of the Ethiopians, who had the charge of all her treasure, and had come to Jerusalem for to worship,
1 Timothy 6:15
Which in his times he shall shew, who is the blessed and only Potentate, the King of kings, and Lord of lords;