favor vs grievance

favor

noun
  • Mildness or mitigation of punishment; lenity. 

  • A small gift; a party favor. 

  • A kind or helpful deed; an instance of voluntarily assisting (someone). 

  • Partiality; bias 

  • Goodwill; benevolent regard. 

  • The object of regard; person or thing favoured. 

verb
  • To resemble; especially, to look like (another person). 

  • To do a favor [noun sense 1] for; to show beneficence toward. 

  • To look upon fondly; to prefer. 

  • To use more often. 

  • To encourage, conduce to 

  • To treat with care. 

grievance

noun
  • Violation of regulations or objectionable behavior. 

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

  • Feelings of being wronged; outrage. 

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

  • A complaint or annoyance. 

  • Something which causes grief. 

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