burnable vs incendiarism

burnable

noun
  • Anything that can be burned. 

adj
  • Able to be burned; combustible 

incendiarism

noun
  • The act or practice of burning property; arson. 

  • Inflammatory or provocative action; instigation. 

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