knockback vs rejectedness

knockback

noun
  • A rejection; a refusal. 

  • A blow that causes the recipient to fall or move backwards, a knock back; a recoil. 

  • Something that impedes or reverses progress; a setback. 

rejectedness

noun
  • The condition of being rejected. 

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