Considering its current definition (see below) and the wish to be politically correct, I wonder whether the word has come to acquire any racist overtone.
What is a coal miner hewer-Ask.com. Coal miner hewer is a person who hews or cuts the coal from its natural situation. The hewer is the actual coal-digger removing it from the coal face.
A pneumatic jackhammer, also known as a pneumatic drill or pneumatic hammer, is a jackhammer that uses compressed air as the power source. The air supply usually comes from a portable air compressor driven by a diesel engine. Reciprocating compressors were formerly used.