Answer: pickax

AnswerCrossword Clue
PICKAXIt can be groundbreaking
PICKAXRock pile worker's tool
PICKAXMattock.
PICKAXChipper?
pickaxplectrum
pickaxsharp-pointed tool for breaking up soil, rock, etc.
pickaxpointed tool
pickaxto use a tool for breaking hard surfaces, also PICKAXE