self-contradiction vs sophistry

self-contradiction

noun
  • A statement that contains a contradiction, or a premise from which one could be derived 

sophistry

noun
  • An argument that seems plausible, but is fallacious or misleading, especially one devised deliberately to be so; a sophism. 

  • The actions or arguments of a sophist. 

  • Plausible yet fallacious argumentations or reasoning. 

How often have the words self-contradiction and sophistry occurred in a corpus of books? (source: Google Ngram Viewer )