grassroots vs orthodox

grassroots

adj
  • Of, or relating to people or society at the local level, particularly in politics, social movements, etc.; of the grass roots. 

orthodox

adj
  • Adhering to whatever is customary, traditional, or generally accepted. 

  • Of a branch of Judaism. 

  • Of pollen, seed, or spores: viable for a long time; viable when dried to low moisture content. 

  • Of the eastern churches, Eastern Orthodox. 

  • Conforming to the accepted, established, or traditional doctrines of a given faith, religion, or ideology. 

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