giggle vs sneer

giggle

verb
  • To laugh gently in a playful, nervous, or affected manner. 

noun
  • Fun; an amusing episode. 

  • A high-pitched, silly laugh. 

sneer

verb
  • To utter with a grimace or contemptuous expression; to say sneeringly. 

  • To raise a corner of the upper lip slightly, especially in scorn 

noun
  • A display of contempt; scorn. 

  • A facial expression where one slightly raises one corner of the upper lip, generally indicating scorn. 

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