castoff vs treason

castoff

noun
  • Something that has been rejected or discarded; a reject. 

adj
  • discarded, rejected. 

treason

noun
  • An act of treachery, betrayal of trust or confidence. 

  • The crime of betraying one’s own country. 

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