parturient vs substantial

parturient

noun
  • A substance that facilitates labour. 

  • One who is in labour, who is about to give birth, or who has recently given birth. 

adj
  • Of, related to, or caused by childbirth 

  • Facilitating labour. 

  • In labour, about to give birth, or having recently given birth. 

  • About to create a new product, or float a new idea. 

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