bigmouth vs yapper

bigmouth

noun
  • One who talks too much or says things which should not be said. 

adj
  • Applied to various creatures that have a large mouth. 

yapper

noun
  • One's mouth, especially of a gossipy person. 

  • A dog, especially of a small breed. 

  • One who yaps. 

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