periphrase vs tautology

periphrase

noun
  • The use of more words than are necessary to express the idea; a roundabout, or indirect, way of speaking; circumlocution. 

verb
  • To use circumlocution. 

  • To express by periphrase or circumlocution. 

tautology

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

  • An expression that features tautology. 

  • 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 periphrase and tautology occurred in a corpus of books? (source: Google Ngram Viewer )