objective vs substantial

objective

adj
  • Of or relating to a material object, actual existence or reality. 

  • Of, or relating to verbal conjugation that indicates the object (patient) of an action. (In linguistic descriptions of Tundra Nenets, among others.) 

  • Not influenced by the emotions or prejudices. 

  • Based on observed facts; without subjective assessment. 

  • Of, or relating to a noun or pronoun used as the object of a verb. 

noun
  • a noun or pronoun in the objective case. 

  • The lens or lenses of a camera, microscope, or other optical device closest to the object being examined. 

  • A material object that physically exists. 

  • The objective case. 

  • A goal that is striven for. 

substantial

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

  • Most important; essential. 

  • 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. 

noun
  • Anything having substance; an essential part. 

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