grievance vs grudge

grievance

noun
  • A wrong or hardship suffered, which is the grounds of a complaint. 

  • A formal complaint, especially in the context of a unionized workplace. 

  • Feelings of being wronged; outrage. 

  • Violation of regulations or objectionable behavior. 

  • A complaint or annoyance. 

  • Something which causes grief. 

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). 

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