crackling vs sibilation

crackling

noun
  • The making of small, sharp cracks or reports, frequently repeated. 

  • A crispy, fried skin or rind, especially of pork. 

  • Fat that, after roasting a joint, hardens and crispens 

  • The crispy rind of roast pork. 

  • Three stripes of velvet worn on the sleeves of students at St John's College, Cambridge. 

adj
  • Sounding with small, sharp cracks or reports, frequently repeated. 

sibilation

noun
  • A hissing sound. 

  • From the shadows emanated a hushed sibilation. 

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