diffuseness vs tautology

diffuseness

noun
  • The result or product of being diffuse. 

  • The state or quality of being diffuse. 

tautology

noun
  • An expression that features tautology. 

  • Redundant use of words, a pleonasm, an unnecessary and tedious repetition. 

  • A statement that is true for all truth values of its Boolean atoms. 

  • A statement that is true for all truth values of its propositional variables. 

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