recoupment vs repurchase

recoupment

noun
  • A recovery of what had been lost; reimbursement. 

  • A reduction of the plaintiff's damages by keeping out a part. 

repurchase

noun
  • The act of repurchasing. 

verb
  • To buy back or again; to regain by purchase. 

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