fundamentalism vs radicalism

fundamentalism

noun
  • The tendency to reduce a religion to its most fundamental tenets, based on strict interpretation of core texts. 

  • A rigid conformity to any set of basic tenets. 

  • The belief that fundamental financial quantities are the best predictor of the price of a financial instrument. 

radicalism

noun
  • Any of various radical social or political movements that aim at fundamental change in the structure of society 

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