defraud vs four-flush

defraud

verb
  • To obtain money or property from (a person) by fraud; to swindle. 

four-flush

verb
  • To bluff. 

  • To attempt to pass off a four-flush as a flush. 

noun
  • Four cards of the same suit. 

How often have the words defraud and four-flush occurred in a corpus of books? (source: Google Ngram Viewer )