grudge vs mordacity

grudge

noun
  • Deep-seated and/or long-term animosity or ill will about something or someone, especially due to a past misdeed or mistreatment. 

verb
  • To be unwilling to give or allow (someone something). 

mordacity

noun
  • The quality of being mordacious; biting severity, or sarcastic quality. 

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