haha vs laugh like a drain

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. 

laugh like a drain

verb
  • To laugh with a loud, coarse sound 

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