oral cavity vs yap

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. 

yap

noun
  • The mouth, which produces speech. 

  • The high-pitched bark of a small dog, or similar. 

  • Casual talk; chatter. 

  • A badly behaved child; a brat. 

verb
  • Of a small dog, to bark. 

  • To talk, especially excessively; to chatter. 

  • To rob or steal from (someone). 

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