impeach vs reproach

impeach

verb
  • To charge with impropriety; to discredit; to call into question. 

  • To bring a legal proceeding against a public official. 

  • To hinder, impede, or prevent. 

  • To demonstrate in court that a testimony under oath contradicts another testimony from the same person, usually one taken during deposition. 

reproach

verb
  • To criticize or rebuke (someone). 

  • To disgrace, or bring shame upon. 

noun
  • A mild rebuke, or an implied criticism. 

  • Disgrace or shame. 

  • An object of scorn. 

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