drilling vs impalement

drilling

noun
  • Act of drilling. 

  • A heavy, twilled fabric of linen or cotton; drill. 

  • A long firearm with three barrels (typically a mix of shotgun and rifle barrels). 

impalement

noun
  • The act of torturing or executing someone by impaling them on a sharp stake. 

  • (obsolete) In the sense of an enclosure, the calyx of a flower. In still older works, also spelt empalement (q.v.) 

  • A space fenced in, such as by palings, possibly in the form of an enclosure or cup. 

  • The joining of two coats of arms on one shield. 

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