hoar vs slate gray

hoar

noun
  • A white or greyish-white colour. 

  • Hoariness; antiquity. 

adj
  • Hoarily bearded. 

  • Of a white or greyish-white colour. 

slate gray

noun
  • A dark bluish grey colour. 

adj
  • Of a dark bluish grey colour. 

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