extermination vs off-ramp

extermination

noun
  • Elimination. 

  • The act of exterminating; total destruction or eradication 

off-ramp

noun
  • An exit strategy. 

  • A segment of roadway that directs vehicular traffic from a freeway onto local roads. 

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