No, lossy is a capacitor term too. A perfect capacitor would have no resistive losses at all. All of the energy you put into it via charging would be delivered back to you on discharge. But real capacitors have resistance as well, it absorbs some of the energy in the AC component of the input, and causes the capacitor to heat up.
Dave
Probably. The run capacitor would be too large to fit the space provided for a start capacitor of the same voltage and capacitance rating, but it ought to work fine electrically. The start capacitor used as a run capacitor would soon overheat.
Dave
and explode! Run caps are often oil-filled (self-healing) types.
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