pools vs raffle

pools

raffle

noun
  • A drawing, often held as a fundraiser, in which tickets or chances are sold to win a prize. 

  • refuse; rubbish 

verb
  • To participate in a raffle. 

  • To award something by means of a raffle or random drawing, often used with off. 

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