fiery vs igneous

fiery

adj
  • Of or relating to fire. 

  • Inflammable or easily ignited. 

  • Burning or glowing. 

  • Tempestuous or emotionally volatile. 

  • Hot or inflamed. 

  • Having the colour of fire. 

  • Spirited or filled with emotion. 

igneous

adj
  • Pertaining to or having the nature of fire; containing fire; resembling fire. 

  • Resulting from, or produced by, great heat. With rocks, it could also mean formed from lava or magma. 

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