idiocy vs thickness

idiocy

noun
  • An act lacking intelligence or sense; an instance of senselessness; extremely foolish behaviour. 

thickness

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

noun
  • 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). 

  • The property of being thick (in dimension). 

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