castoff vs disloyalty

castoff

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

adj
  • discarded, rejected. 

disloyalty

noun
  • An act of being disloyal; a betrayal, faithbreach. 

  • The quality of being disloyal. 

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