ash-colored vs grey

ash-colored

adj

  • Of the color of ashes; pale grey. 

grey

adj

  • UK and Commonwealth standard spelling of gray. 

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

verb

  • UK and Commonwealth standard spelling of gray. 

noun

  • UK and Commonwealth standard spelling of gray. 

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