penitence vs rue

penitence

noun
  • The condition of being penitent; a feeling of regret or remorse for doing wrong or sinning. 

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 penitence and rue occurred in a corpus of books? (source: Google Ngram Viewer )