coat tree vs hatstand

coat tree

noun
  • An upright pole having hooks on which to hang coats or other clothing 

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. 

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