crass vs polychromate

crass

adj
  • dense 

  • materialistic 

  • Lacking finesse; crude and obvious. 

  • coarse; crude; unrefined or insensitive; lacking discrimination 

polychromate

adj
  • Composed of many colours 

noun
  • A salt or ion composed of multiple chromate groups 

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