An omnipotent being or omnipotent race was an individual or species which displayed omnipotence.
The Q were often referred to as omnipotent beings. (TNG: "True Q"; VOY: "The Q and the Grey", "Q2")
In 2378, Q Junior, who was supposed to be the savior of the Q Continuum, asked Captain Kathryn Janeway how to save a race that was already omnipotent. (VOY: "Q2")