comfort vs heat up

comfort

verb
  • To make comfortable. 

  • To relieve the distress or suffering of; to provide comfort to. 

noun
  • A cause of relief or satisfaction. 

  • Something that offers comfort. 

  • A consolation; something relieving suffering or worry. 

  • Contentment, ease. 

heat up

verb
  • To become more exciting or intense. 

  • To heat, to cause to become hotter. 

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