castoff vs worn out

castoff

adj
  • discarded, rejected. 

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

worn out

adj
  • Damaged and useless due to hard or continued use. 

  • Exhausted or fatigued from exertion. 

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