laugh at vs scoff

laugh at

verb
  • To scorn or tease; to evince contempt or pity for someone, usually contrasted with laugh with. 

  • Used other than figuratively or idiomatically: see laugh, at. 

scoff

verb
  • To jeer; to laugh with contempt and derision. 

  • To eat. 

  • To eat food quickly. 

  • To mock; to treat with scorn. 

noun
  • A derisive or mocking expression of scorn, contempt, or reproach. 

  • The act of eating. 

  • An object of scorn, mockery, or derision. 

  • Food. 

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