haha vs prank

haha

verb
  • To laugh. 

noun
  • Type of boundary to a garden, pleasure-ground, or park, designed not to interrupt the view and to be invisible until closely approached. 

  • A large leafy Hawaiian plant, Gunnera petaloidea. 

intj
  • An onomatopoeic representation of laughter. 

prank

verb
  • To perform a practical joke on; to trick. 

  • To make an ostentatious show. 

  • To call someone's phone and promptly hang up 

noun
  • A practical joke or mischievous trick. 

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