haha vs titter

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. 

titter

verb
  • To laugh or giggle in a somewhat subdued or restrained way, as from nervousness or poorly-suppressed amusement. 

noun
  • A nervous or somewhat repressed giggle. 

  • A woman's breast. 

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