guardian angel vs tutelary deity

guardian angel

noun
  • A tutelary angel watching over a particular person in monotheistic contexts. 

  • A person who watches over another. 

tutelary deity

noun
  • A deity, usually minor, serving as a tutelary (guardian or supporter) for a place, person, group, or activity. 

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