extermination vs feticide

extermination

noun
  • The act of exterminating; total destruction or eradication 

  • Elimination. 

feticide

noun
  • One who kills a fetus. 

  • The killing of a fetus or embryo; an induced abortion. 

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