diffuseness vs taciturnity

diffuseness

noun
  • The state or quality of being diffuse. 

  • The result or product of being diffuse. 

taciturnity

noun
  • The trait of being taciturn. 

  • Failure to assert a legal right in a way that implies that it is being given up. 

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