passionate vs smouldering

passionate

adj
  • Fired with intense feeling. 

  • Given to strong feeling, sometimes romantic, sexual, or both. 

noun
  • A passionate individual. 

smouldering

adj
  • Burning slowly, producing smoke but no flame. 

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

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