genitor vs guardian

genitor

noun
  • a biological parent (either male or female), or the direct cause of an offspring. 

  • a generator; an originator 

guardian

noun
  • A person legally responsible for a minor (in loco parentis). 

  • A superior in a Franciscan monastery. 

  • A person legally responsible for an incompetent person. 

  • Someone who guards, watches over, or protects. 

  • A major or final enemy; boss. 

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