guardian angel vs kobold

guardian angel

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

  • A person who watches over another. 

kobold

noun
  • An ambivalent, sometimes vindictive, spirit that is capable of materialising as an object or human, often a child; a sprite. 

  • One of a diminutive and usually malevolent race of beings. 

  • A mischievous elf or goblin, or one connected (and helpful) to a family or household. 

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