refund vs satisfy

refund

verb
  • To return (money) to (someone); to reimburse. 

noun
  • An amount of money returned. 

satisfy

verb
  • To pay to the extent of what is claimed or due. 

  • To do enough for; to meet the needs of; to fulfill the wishes or requirements of. 

  • To cause (a sentence) to be true when the sentence is interpreted in one's universe. 

  • To answer or discharge (a claim, debt, legal demand, etc.); to give compensation for. 

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