CHiP vs buttons

CHiP

noun
  • An officer of the California Highway Patrol 

buttons

noun
  • A small South African plant of the genus Conophytum, with button-like succulent leaves covering its exterior. 

  • Synonym of marbles (“sanity; mental faculties”) 

  • The dung of sheep. 

  • A remote control. 

  • A policeman. 

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