big mouth vs diffuseness

big mouth

noun
  • A person who talks too much, especially by making exaggerated claims or by inappropriately revealing information. 

  • The mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information. 

diffuseness

noun
  • The state or quality of being diffuse. 

  • The result or product of being diffuse. 

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