hell's bells vs wo

hell's bells

intj

  • An expression of frustration, outrage, or surprise. 

noun

  • Jimsonweed (Datura stramonium). 

wo

intj

  • A call to cause a horse to slow down or stop; whoa. 

  • A falconer's call to a hawk. 

noun

  • A wall. 

How often have the words hell's bells and wo occurred in a corpus of books? (source: Google Ngram Viewer )