castoff vs constancy

castoff

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

adj
  • discarded, rejected. 

constancy

noun
  • An unchanging quality or characteristic of a person or thing. 

  • The quality of being constant; steadiness or faithfulness in action, affections, purpose, etc. 

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