downthrow vs extermination

downthrow

noun
  • Ruin; defeat. 

  • A depression of the strata on one side of a fault 

extermination

noun
  • The act of exterminating; total destruction or eradication 

  • Elimination. 

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