firestorm vs smouldering

firestorm

noun
  • A fire whose intensity is greatly increased by inrushing winds. 

  • An intense or violent altercation. 

smouldering

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

adj
  • Burning slowly, producing smoke but no flame. 

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