#knife_edge__knifeedge__cutting_edge__cuttingedge  the sharp cutting side of the blade of a knife
  supertype:  edge  a sharp side formed by the intersection of two surfaces of an object; "he rounded the edges of the box"
  part of:  blade.cutting_implement  the flat part of a tool or weapon that (usually) has a cutting edge
     part of:  ax__axe  an edge tool with a heavy bladed head mounted across a handle
     part of:  knife  edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle
     part of:  lawn_mower__mower  garden tool for mowing grass on lawns
     part of:  pair_of_scissors__scissors  and edge tool having two crossed pivoting blades
     part of:  spatula  a hand tool with a thin flexible blade used to mix or spread soft substances
     part of:  spatula.food_turner  a turner with a narrow flexible blade
     part of:  sword__blade__brand__steel  a cutting or thrusting weapon with a long blade
  part of:  edge_tool  any cutting tool with a sharp cutting edge (as a chisel or knife or plane or gouge)

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