fervor vs warmth

fervor

noun
  • Heat. 

  • An intense, heated emotion; passion, ardor. 

  • A passionate enthusiasm for some cause. 

warmth

noun
  • A moderate degree of heat; the sensation of being warm. 

  • Friendliness, kindness or affection. 

  • The effect of using mostly red and yellow hues. 

  • Fervor, intensity of emotion or expression. 

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