Sound is simply the catch-all name for repeated pressure differences/vibrations in a range that a human can hear. Outside this range you get ultra- or infrasound, rather arbitrarily defined. Outside that extended range you're left with the language of physics, i.e. direct description of the pressures and the frequencies involved. The word sound really doesn't mean anything, it's just the human label on a set of sensory inputs. You might as well ask how nutritious "food" can get.
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