The difference between Zero point and Zero-point energy
When used as nouns, zero point means the location of the center of a burst of a nuclear weapon at the instant of detonation. the zero point may be in the air, or on or beneath the surface of land or water, depending upon the type of burst, and it is thus to be distinguished from ground zero, whereas zero-point energy means the energy possessed by something at a temperature of absolute zero.
check bellow for the other definitions of Zero point and Zero-point energy
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Zero point as a noun (military):
The location of the center of a burst of a nuclear weapon at the instant of detonation. The zero point may be in the air, or on or beneath the surface of land or water, depending upon the type of burst, and it is thus to be distinguished from ground zero.
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Zero-point energy as a noun:
The energy possessed by something at a temperature of absolute zero
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Zero-point energy as a noun (physics):
The lowest possible energy of any quantum mechanical system; a consequence of the uncertainty principle