aflame vs smouldering

aflame

adj
  • in flames, on fire, flaming, with flames coming from it 

  • showing anger or contempt 

smouldering

adj
  • Burning slowly, producing smoke but no flame. 

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

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