hatstand vs thunderbox

hatstand

noun
  • A device used to store hats upon, consisting of a vertical pole with a sturdy base to prevent toppling, and an array of pegs to hold the hats. 

adj
  • Crazy, insane. 

thunderbox

noun
  • A chamber pot enclosed in a box; a portable commode. 

  • Any lavatory or toilet, especially a rudimentary outdoor latrine or toilet, or an outhouse. 

  • A box of metal balls which is shaken to create a thunder sound effect. 

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