Any implement that is used to make something (an edge or a point) sharper.

Roget 253: sharpness etc. adj.; acuity, acumination^†; spinosity^†.    point, spike, spine, spicule [Biol.], spiculum^†; needle, hypodermic needle, tack, nail, pin; prick, prickle; spur, rowel, barb; spit, cusp; horn, antler; snag; tag thorn, bristle; Adam's needle^†, bear grass [U.S.], tine, yucca.    nib, tooth, tusk; spoke, cog, ratchet.    crag, crest, arete [Fr.], cone peak, sugar loaf, pike, aiguille^†; spire, pyramid, steeple.    beard, chevaux de frise [Fr.], porcupine, hedgehog, brier, bramble, thistle; comb; awn, beggar's lice, bur, burr, catchweed^†, cleavers, clivers^†, goose, grass, hairif^†, hariff, flax comb, hackle, hatchel^†, heckle.    wedge; knife edge, cutting edge; blade, edge tool, cutlery, knife, penknife, whittle, razor, razor blade, safety razor, straight razor, electric razor; scalpel; bistoury^†, lancet; plowshare, coulter, colter^†; hatchet, ax, pickax, mattock, pick, adze, gill; billhook, cleaver, cutter; scythe, sickle; scissors, shears, pruning shears, cutters, wire cutters, nail clipper, paper cutter; sword etc. (arms) 727; bodkin etc. (perforator) 262; belduque^†, bowie knife^†, paring knife; bushwhacker [U.S.]; drawing knife, drawing shave; microtome [Micro.]; chisel, screwdriver blade; flint blade; guillotine.    sharpener, hone, strop; grindstone, whetstone; novaculite^†; steel, emery.    ... show more

Dutch: potloodslijper, puntenslijper, punteslijper, slijpapparaat, slijper
Polish: ostrzałka