WordNet sense 1 (a mixture of potassium nitrate, charcoal, and sulfur in a 75:15:10 ratio which is used in gunnery, time fuses, and fireworks):

gunpowder

WordNet sense 2 (a solid substance in the form of tiny loose particles; a solid that has been pulverized):

pulverization, pulverisation

WordNet sense 3 (make into a powder by breaking up or cause to become dust):

pulverize, powderise, powderize, pulverise