oddity vs wackadoo

oddity

noun

  • A strange person; an oddball. 

  • Strangeness. 

  • An odd or strange thing or opinion. 

wackadoo

noun

  • A crazy person, a wacko. 

adj

  • Crazy, wacky. 

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