lassitude vs warmth

lassitude

noun
  • Lethargy or lack of energy; fatigue. 

  • Listlessness or languor. 

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 lassitude and warmth occurred in a corpus of books? (source: Google Ngram Viewer )