legitimate vs substantial

legitimate

adj
  • Authentic, real, genuine. 

  • In accordance with the law or established legal forms and requirements. 

  • Lawfully begotten, i.e., born to a legally married couple. 

  • Relating to hereditary rights. 

  • Belonging or relating to the legitimate theater. 

  • Conforming to known principles, or established or accepted rules or standards; valid. 

verb
  • To make legitimate, lawful, or valid; especially, to put in the position or state of a legitimate person before the law, by legal means. 

noun
  • A person born to a legally married couple. 

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