chortle vs have a laugh

chortle

verb
  • To laugh with a chortle or chortles. 

noun
  • A similar sounding vocalisation of various birds. 

  • A joyful, somewhat muffled laugh, rather like a snorting chuckle. 

have a laugh

verb
  • To laugh. 

  • To joke; kid around. 

  • To enjoy oneself; have fun. 

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