prey vs underdog

prey

noun
  • A person or thing given up as a victim. 

  • That which is or may be seized by animals or birds to be devoured 

  • A living thing that is eaten by another living thing. 

  • The victim of a disease. 

verb
  • To act as a predator. 

underdog

noun
  • Somebody at a disadvantage. 

  • A high swing wherein the person pushing the swing runs beneath the swing while the person being pushed is at the forward limit of the arc. 

  • A competitor thought unlikely to win. 

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