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This may or may not be synonymous with the question "is there free will?"
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will power is generally thought of as the ability for an organism to use long-term reasoning to resist gratification or short-term rewards. Hypothetically, you might measure inhibitory dampening on primitive drives in the brain (or something...). It's theoretically a measurable quantity.
free will is the idea that some independent entity (like a soul) exists that makes decisions independent of causation. It's not measurable or falsifiable, but lots of evidence suggests no such entity exists.