castoff vs derelict

castoff

adj
  • discarded, rejected. 

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

derelict

adj
  • Abandoned, forsaken; given up by the natural owner or guardian; (of a ship) abandoned at sea, dilapidated, neglected; (of a spacecraft) abandoned in outer space. 

  • Negligent in performing a duty. 

  • Lost; adrift; hence, wanting; careless; neglectful; unfaithful. 

noun
  • A homeless and/or jobless person; a person who is (perceived as) negligent in their personal affairs and hygiene. (This sense is a modern development of the preceding sense.) 

  • Property abandoned by its former owner, especially a ship abandoned at sea. 

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