guerdon vs saving grace

guerdon

noun
  • A reward, prize or recompense for a service; an accolade. 

verb
  • To give such a reward to. 

saving grace

noun
  • A redeeming quality or factor. 

  • God's grace or blessing, enabling sinners to attain salvation. 

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