boo-boo vs unfun

boo-boo

noun
  • A mistake or error. 

  • Feces. 

  • A minor injury, such as a cut or a bruise. 

verb
  • To defecate. 

  • To make a mistake. 

unfun

noun
  • Lack or absence of fun; funlessness. 

adj
  • Not fun. 

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