drill bit vs twist drill

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. 

twist drill

noun
  • A rotating cutting tool, used for cutting holes in rigid materials, that consists of an essentially conical point, relieved and fluted to form cutting lips, and spiral flutes which direct the chips away from the lips and toward ejection from the hole. 

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