impeach vs launder

impeach

verb
  • To bring a legal proceeding against a public official. 

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

  • 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. 

launder

noun
  • A gutter (for rainwater). 

  • A trough or channel carrying water to the wheel of a watermill. 

  • A trough used by miners to receive powdered ore from the box where it is beaten, or for carrying water to the stamps, or other apparatus for comminuting (sorting) the ore. 

verb
  • To disguise the source of (ill-gotten wealth) by various means. 

  • To wash; to wash, and to smooth with a flatiron or mangle; to wash and iron. 

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