grey vs grey-headed

grey

adj
  • UK and Commonwealth standard spelling of gray. 

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

noun
  • UK and Commonwealth standard spelling of gray. 

verb
  • UK and Commonwealth standard spelling of gray. 

grey-headed

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