harebrain vs muddler

harebrain

noun
  • A person who lacks good sense; One who is foolish and reckless. 

muddler

noun
  • A person or thing that muddles. 

  • A tool used in muddling, used to mash and mix. 

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