entity vs substantial

entity

noun
  • The existence of something considered apart from its properties. 

  • That which has a distinct existence as an individual unit. Often used for organisations which have no physical form. 

  • Anything about which information or data can be stored in a database; in particular, an organised array or set of individual elements or parts. 

  • The state or quality of being or existence. 

  • An alien lifeform that has no corporeal body. 

  • A spirit, ghost, or the like. 

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 entity and substantial occurred in a corpus of books? (source: Google Ngram Viewer )