guerdon vs perquisite

guerdon

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

verb
  • To give such a reward to. 

perquisite

noun
  • Any monetary or other incidental benefit beyond salary. 

  • A privilege or possession held or claimed exclusively by a certain person, group or class. 

  • A gratuity. 

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