ethnic vs grassroots

ethnic

adj
  • Of or relating to a group of people having common racial, ancestral, national, religious or cultural origins. 

  • Representative of a folk or traditional mode of expression. 

  • Characteristic of a foreign or a minority group's culture. 

  • Heathen, not Jewish, Christian, or Muslim. 

noun
  • The demonym of an Ancient Greek city. 

  • An ethnic person, especially a foreigner or member of an immigrant community. 

grassroots

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

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