funny ha-ha vs haha

funny ha-ha

adj
  • Humorous, as opposed to strange (the other meaning of funny). 

  • Humorous, as opposed to serious or nonfunny. 

haha

intj
  • An onomatopoeic representation of laughter. 

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. 

verb
  • To laugh. 

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