josh vs titter

josh

verb
  • To make or exchange good-natured jokes. 

  • To tease someone in a kindly or friendly fashion. 

noun
  • An instance of good-natured banter. 

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 josh and titter occurred in a corpus of books? (source: Google Ngram Viewer )