Omnipotence

Omnipotence is the ability to do anything non contra-dictionary.

Omnipotence
No being in the supernatural universe is powerful in a way, that it could do everything that doesn't contradict itself.

Near-Omnipotence
True God-Like beings of near-unimaginable power that can create other sentient beings,dimensions, and or warp of the Universe to their whim.
 * God - God possesses near-infinite power, being able to do almost anything that He desires. It is shown that he isn't fully omnipotent, as he can't kill the Darkness, or even fight it alone. However, through his own power he was able to create beings who helped him to finally defeat The Darkness.
 * The Darkness - While unknown the powers or strengths of the Darkness, it's was credited by Death that it took God himself and His Legion od Archangels to defeat and seal it away.
 * Death - Death holds immense power which is far greater than Archangels. However he isn't actually omnipotent, there are many things he can't do (split souls apart, kill a person bearing the mark of Cain, etc.)

Extremely powerful
Entities of immense power, that can apparently warp reality or destroy and create things to a limited extent.
 * Castiel (temporarily) - Castiel's powers were exponentially magnified as a result of having absorbed millions of souls from Purgatory. It was implied that he was still significantly weaker than God, as Death said that Castiel was no God even with 40,000,000 souls. At this power level, Castiel could annihilate even lower archangels.
 * Archangels - Archangels have a tremendously vast supply of power, but there is still much that they can't do. They can accomplish incredible feats in gestures, finger snaps, winks or even simple thoughts.
 * Jesse Turner - Fueled by Lucifer's presence on Earth, Jesse could have almost accomplish any feat by verbally saying into existence.