casuistry vs purism

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. 

purism

noun
  • An insistence on pure or unmixed forms. 

  • An example of purist language etc. 

  • The desire to use words and forms derived from what is considered the native element in a given language instead of elements considered borrowed or foreign. 

  • An insistence on the traditionally correct way of doing things. 

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