castoff vs departing

castoff

adj
  • discarded, rejected. 

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

departing

adj
  • that is leaving 

  • while leaving 

noun
  • The act by which somebody or something departs. 

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