WordNet sense 1 (the ossicle attached to the eardrum):

malleus

WordNet sense 2 (the part of a gunlock that strikes the percussion cap when the trigger is pulled):

cock

WordNet sense 3 (a power tool for drilling rocks):

power hammer

WordNet sense 4 (create by hammering):

forge

WordNet sense 5 (the act of pounding (delivering repeated heavy blows)):

hammering, pound, pounding