grey vs of color

grey

adj
  • Synonym of coloured (pertaining to the mixed race of black and white). 

  • UK and Commonwealth standard spelling of gray. 

noun
  • UK and Commonwealth standard spelling of gray. 

verb
  • UK and Commonwealth standard spelling of gray. 

of color

adj
  • Nonwhite; of a race other than white, for example black. 

  • Belonging to a category of people with mixed black and white ancestry in the Americas in the 18th and early 19th centuries. 

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