avant-garde vs nontraditional

avant-garde

adj
  • Innovative, pioneering, especially when extremely or obviously so. 

noun
  • Any group of people who invent or promote new techniques or concepts, especially in the arts. 

nontraditional

adj
  • Innovative; new; daring 

  • Not traditional; not related to tradition, untraditional 

How often have the words avant-garde and nontraditional occurred in a corpus of books? (source: Google Ngram Viewer )