* δύναμις (dýnamis): This is probably the closest general equivalent, often referring to ability, capacity, potential, or inherent power. It's the root of the English word "dynamic."
* κράτος (krátōs): This signifies political power, dominion, or rule. It's related to words like "democracy" and "aristocracy."
* ἰσχύς (ischýs): This emphasizes strength and physical power.
The best choice depends on the context.