essence vs substantial

essence

noun
  • Constituent substance. 

  • The concentrated form of a plant or drug obtained through a distillation process. 

  • A being; especially, a purely spiritual being. 

  • An extract or concentrate obtained from a plant or other matter used for flavouring, or as a restorative. 

  • The true nature of anything, not accidental or illusory. 

  • The inherent nature of a thing or idea. 

  • A significant feature of something. 

  • Fragrance, a perfume. 

substantial

noun
  • Anything having substance; an essential part. 

adj
  • Most important; essential. 

  • Not imaginary; real; actual; true; veritable. 

  • Having a substance; actually existing. 

  • Corporeal; material; firm. 

  • Possessed of goods or an estate; moderately wealthy. 

  • Satisfying; having sufficient substance to be nourishing or filling. 

  • Large in size, quantity, or value; ample; significant. 

  • Having good substance; strong; stout; solid; firm. 

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