snitch vs speak for

snitch

verb
  • To inform on, especially in betrayal of others. 

  • To contact or cooperate with the police for any reason. 

noun
  • A ball used in the sport of Quidditch. 

  • A thief. 

  • An informer, one who betrays his group. 

  • A nose. 

  • A tiny morsel. 

speak for

verb
  • To speak on somebody's behalf. 

  • To represent an intrinsic quality 

  • Used other than figuratively or idiomatically: see speak, for. 

  • To claim, reserve, or occupy. 

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