repent vs rue

repent

verb
  • To feel pain, sorrow, or regret for what one has done or omitted to do; the cause for repenting may be indicated with "of". 

  • To feel pain on account of; to remember with sorrow. 

  • To be sorry for, to regret. 

  • To be sorry for sin as morally evil, and to seek forgiveness; to cease to practice sin and to love. 

adj
  • Creeping along the ground. 

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