nebular vs roky

nebular

adj
  • Cloudy; diffuse. 

  • Of or pertaining to a nebula. 

roky

adj
  • Misty; foggy; cloudy. 

  • Exhibiting roke (a defect in steel ingots). 

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