beast of prey vs predator

beast of prey

noun
  • A carnivorous animal that hunts for its food, especially one that preys on vertebrates. 

  • A predatory person, savagely cruel and ruthless in their treatment of others. 

predator

noun
  • Any animal or other organism that hunts and kills other non-plant organisms (their prey), primarily for food. 

  • A sexual predator. 

  • Someone who attacks and plunders for gain. 

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