induced abortion vs miscarriage

induced abortion

noun
  • A surgical or medicinal procedure that terminates a pregnancy by removing the fetus; a therapeutic abortion. It is a non-contraceptive form of birth control. 

miscarriage

noun
  • The spontaneous natural termination of a pregnancy, especially before it is viable; the fatal expulsion of a foetus from the womb before term. 

  • A failure; a mistake or error. 

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