necropsy vs vouchsafe

necropsy

verb
  • The act of performing a necropsy. 

noun
  • The pathological examination of a corpse, particularly to determine cause of death. 

vouchsafe

verb
  • To disclose or divulge. 

  • To graciously give, to condescendingly grant a right, benefit, outcome, etc.; to deign to acknowledge. 

  • To receive or accept in condescension. 

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