grind

[1]	pound , powder , pulverize , abrade , crush , granulate , mill , grate , rasp , crumble , kibble , mash , triturate , bray , comminute
[2]	sharpen , whet , file , smooth , polish
[3]	gnash , grit , grate
[4]	grind away , labour , toil , slave (away) , study , lucubrate , burn the midnight oil , (Colloq) cram , (Brit) swot
[5]	grind down , crunch , cranch , wear down/away , crush , craunch , oppress , subdue , suppress , tyrannize , persecute , maltreat , ill-treat , harry , harass , hound , hector , plague , badger
[6]	grind out , grate , produce , generate , crank out , churn out , turn out
[7]	labor , labour , toil , fag , travail , drudge , dig , moil
[8]	mash , crunch , bray , comminute

[1]	swot , nerd , wonk , dweeb
[2]	drudgery , plodding , donkeywork
[3]	mill , pulverization , pulverisation
[4]	toil , labour , drudgery , travail , exertion , task , chore