drill bit vs spade

drill bit

noun
  • Any other style of cutter, for example a spade drill, that is rotated and fed in a similar manner as a twist drill to of cut a hole in metal, wood or other materials. 

  • A twist drill. 

spade

noun
  • A garden tool with a handle and a flat blade for digging. Not to be confused with a shovel which is used for moving earth or other materials. 

  • A playing card marked with the symbol ♠. 

  • A castrated man or animal. 

  • A black person. 

  • A cutting instrument used in flensing a whale. 

  • A hart or stag three years old. 

verb
  • To turn over soil with a spade to loosen the ground for planting. 

How often have the words drill bit and spade occurred in a corpus of books? (source: Google Ngram Viewer )