guardian vs survivor

guardian

noun
  • A person legally responsible for an incompetent person. 

  • A superior in a Franciscan monastery. 

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

  • Someone who guards, watches over, or protects. 

  • A major or final enemy; boss. 

survivor

noun
  • One who knew a specific decedent. 

  • A person who is able to endure hardship. 

  • One who survives, especially one who survives a traumatic experience. 

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