incineration vs smouldering

incineration

noun
  • The act of incinerating, or the state of being incinerated; cremation. 

smouldering

noun
  • The act by which something smoulders; residual heat. 

adj
  • Burning slowly, producing smoke but no flame. 

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