* κράτος (kratos): This word refers to strength, power, and dominion, often in a political or ruling sense. It's probably the closest single word.
* ἰσχύς (ischys): This word emphasizes physical strength and might.
* δύναμις (dynamis): This word is broader, encompassing strength, power, ability, and potential.
So, while there's no single perfect equivalent, kratos is generally considered the closest single word for "strength" in the sense of power and might.