corn snow vs granule

corn snow

noun
  • Synonym of corn (type of granular snow) 

granule

noun
  • A tiny grain, a small particle. 

  • A small structure in a cell. 

  • a small mark in the photosphere of the sun caused by convection currents. See also Wikipedia:Granule (solar physics). 

  • A particle from 2 to 4 mm in diameter, following the Wentworth scale 

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