grassroots vs vernacular

grassroots

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

vernacular

adj
  • Belonging to the country of one's birth; one's own by birth or nature. 

  • Of or related to local building materials and styles; not imported. 

  • Connected to a collective memory; not imported. 

  • Of or pertaining to everyday language, as opposed to standard, literary, liturgical, or scientific idiom. 

noun
  • Language unique to a particular group of people. 

  • A style of architecture involving local building materials and styles, not imported. 

  • A language lacking standardization or a written form. 

  • Everyday speech or dialect, including colloquialisms, as opposed to standard, literary, liturgical, or scientific idiom. 

  • Indigenous spoken language, as distinct from a literary or liturgical language such as Ecclesiastical Latin. 

  • The language of a people or a national language. 

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