castoff vs pretermission

castoff

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

adj
  • discarded, rejected. 

pretermission

noun
  • Omission; failure to do something. 

  • Preterition; the act of passing over; paralipsis. 

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