waw vs wo

waw

noun

  • A wall. 

  • The twenty-seventh letter of the Arabic alphabet: و. 

wo

noun

  • A wall. 

intj

  • A falconer's call to a hawk. 

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

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