beast of prey vs incubus

beast of prey

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

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

incubus

noun
  • Any oppressive thing or person; a burden. 

  • An evil spirit supposed to oppress people while asleep, especially to have sex with women as they sleep. 

  • One of various of parasitic insects, especially subfamily Aphidiinae. 

  • A feeling of oppression during sleep, sleep paralysis; night terrors, a nightmare. 

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