roky vs vaporific

roky

adj
  • Misty; foggy; cloudy. 

  • Exhibiting roke (a defect in steel ingots). 

vaporific

adj
  • Producing vapour; tending to pass, or to cause to pass, into vapor. 

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