accuse vs impeach

accuse

verb
  • to make an accusation against someone 

  • to find fault with, blame, censure 

  • to charge with having committed a crime or offence 

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. 

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