piquant vs smouldering

piquant

adj
  • Producing a burning sensation due to the presence of chilies or similar spices; spicy, hot. 

  • Stimulating to the senses; engaging; charming. 

  • Favorably stimulating to the palate; pleasantly spicy; tangy. 

smouldering

adj
  • Burning slowly, producing smoke but no flame. 

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

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