castoff vs disregard

castoff

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

adj
  • discarded, rejected. 

disregard

noun
  • The act or state of deliberately not paying attention or caring about; misregard. 

verb
  • To ignore; pay no attention to. 

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