castoff vs self-abnegation

castoff

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

adj
  • discarded, rejected. 

self-abnegation

noun
  • The denial or invalidation of one's own needs, interests, etc. for the sake of another's; the setting aside of self-interest. 

  • An act of self-denial. 

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