grist vs molecule

grist

noun
  • A given size of rope, common grist being a rope three inches in circumference, with twenty yarns in each of the three strands. 

  • Grain that is to be ground in a mill. 

verb
  • To grind in a mill. 

molecule

noun
  • The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds. 

  • A tiny amount. 

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