heaviness vs thickness

heaviness

noun
  • The state of being heavy; weight, weightiness, force of impact or gravity. 

thickness

noun
  • The property of being thick (in dimension). 

  • A measure of how thick (in dimension) something is. 

  • A layer. 

  • The quality of being thick (in consistency). 

  • The property of being thick (slow to understand). 

verb
  • To trim (wood) to a consistent thickness using a thickness planer. 

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