squeal vs squealer

squeal

noun
  • The cry of a pig. 

  • A high-pitched sound, such as the scream of a child or a female person, or noisy worn-down brake pads. 

verb
  • To make a squealing noise. 

  • To scream with a shrill, prolonged sound. 

  • To give sensitive information about someone to a third party; to rat on someone. 

squealer

noun
  • A pig. 

  • An informant. 

  • A young pigeon. 

  • The American golden plover. 

  • Anything that makes a squealing noise. 

  • The European swift. 

  • The harlequin duck. 

  • 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 squeal and squealer occurred in a corpus of books? (source: Google Ngram Viewer )