drill bit vs reamer

drill bit

noun
  • A twist drill. 

  • 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. 

reamer

noun
  • A tool for boring a hole wider. 

  • A tool used to scrape carbon deposit from the bowl of a pipe. 

  • A device for rendering citrus juice. 

  • A Stone Age prehistoric lithic stone tool, used in archeology nomenclature. 

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