buttons vs prisoner

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. 

prisoner

noun
  • Any person held against their will. 

  • A person who is or feels confined or trapped by a situation or a set of circumstances. 

  • A person incarcerated in a prison, while on trial or serving a sentence. 

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