snitch vs squealer

snitch

noun
  • An informer, one who betrays his group. 

  • A ball used in the sport of Quidditch. 

  • A thief. 

  • A nose. 

  • A tiny morsel. 

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

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

squealer

noun
  • An informant. 

  • A young pigeon. 

  • The American golden plover. 

  • Anything that makes a squealing noise. 

  • The European swift. 

  • The harlequin duck. 

  • A pig. 

  • A kind of jug used to carry beer having 1 litre or 32 ounce capacity (half the size of a growler). 

  • Any animal or person who squeals. 

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