castoff vs oversight

castoff

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

adj
  • discarded, rejected. 

oversight

noun
  • An omission; something that is left out, missed or forgotten. 

  • Supervision or management. 

  • Overview. 

verb
  • To suppress content in a way that removes or minimizes its visibility or viewability. 

  • To oversee; to supervise. 

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