maw vs oral cavity

maw

noun
  • The mouth. 

  • Mother. 

  • Any large, insatiable or perilous opening. 

  • Appetite; inclination. 

  • A gull. 

  • The upper digestive tract (where food enters the body), especially the mouth and jaws of a fearsome and ravenous creature. 

oral cavity

noun
  • The cavity of the mouth, especially the part of the mouth behind the gums and teeth that is bounded above by the hard and soft palates and below by the tongue and by the mucous membrane connecting it with the inner part of the mandible. 

  • The hollow on the lower surface of the head from which the proboscis protrudes. 

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