casuistry vs sophism

casuistry

noun
  • A specious argument designed to defend an action or feeling. 

  • The process of answering practical questions via interpretation of rules, or of cases that illustrate such rules, especially in ethics; case-based reasoning. 

sophism

noun
  • Sophistic, fallacious reasoning or argumentation. 

  • A flawed argument, superficially correct in its reasoning, usually designed to deceive. 

  • The school of the sophists in antiquity; their beliefs and method of teaching philosophy and rhetoric. 

  • An intentional fallacy. 

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