exterminate vs string up

exterminate

verb
  • To kill all of (a population of pests or undesirables), usually intentionally. 

  • To bring a definite end to; finish completely. 

string up

verb
  • To kill (a person) by hanging, especially to lynch. 

  • To concatenate; to link in a line. 

  • To suspend by means of rope, cord or similar material. 

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