shill vs shillelagh

shill

noun
  • Any person paid to endorse a product. 

  • An accomplice at a confidence trick during an auction or gambling game. 

  • A house player in a casino. 

  • A person paid to endorse a product while pretending to be impartial. 

verb
  • To promote or endorse in return for payment, especially dishonestly. 

  • To put under cover; to sheal. 

shillelagh

noun
  • A wooden (traditionally blackthorn (sloe) wood) club ending with a large knob. 

  • Any cudgel, whether or not of Irish origin. 

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