quittance vs recoupment

quittance

noun
  • A release or acquittal. 

  • A discharge from a debt or obligation; a document that shows this discharge. 

recoupment

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

  • A recovery of what had been lost; reimbursement. 

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