febrile vs smouldering

febrile

adj
  • Feverish, or having a high temperature. 

  • Involving fever as a symptom or cause. 

  • Full of nervous energy. 

smouldering

adj
  • Burning slowly, producing smoke but no flame. 

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

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