complain vs rue

complain

verb
  • To express feelings of pain, dissatisfaction, or resentment. 

  • To creak or squeak, as a timber or wheel. 

  • To make a formal accusation or bring a formal charge. 

rue

verb
  • To repent of or regret (some past action or event); to wish that a past action or event had not taken place. 

noun
  • Any of various perennial shrubs of the genus Ruta, especially the herb Ruta graveolens (common rue), formerly used in medicines. 

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