A blower could be viewed as a compressor, because of the general gas pressure rise between inlet and discharge, but a compressor cannot be viewed as a blower due to the higher gas discharge pressures that occur.
So, what is a blower? Normally, they are viewed as low or high volume, low pressure rise gas compression machines. Whereas a compressor, is either a low volume or high volume, high pressure rise gas compression machine.
Now if we're dealing in liquids, those are "pumps".