castoff vs moribund

castoff

adj
  • discarded, rejected. 

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

moribund

adj
  • Almost obsolete, nearing an end. 

  • Approaching death; about to die; dying; expiring. 

noun
  • A person who is near to dying. 

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