central vs substantive

central

adj
  • Having or containing the centre of something. 

  • Being in the centre. 

  • Exerting its action towards the peripheral organs. 

  • Being very important, or key to something. 

noun
  • centre 

substantive

adj
  • of the essence or essential element of a thing. 

  • Constituting the substance of content rather than its style, and thus always nontrivial. 

  • Of or pertaining to a substantive. 

  • actually and legally held, as distinct from an acting, temporary or honorary rank or appointment 

  • Having substance; enduring; solid; firm; substantial. 

  • applying to essential legal principles and rules of right. 

  • Depending on itself; independent. 

  • of a dye that does not need the use of a mordant to be made fast to that which is being dyed 

verb
  • to make a word belonging to another part of speech into a substantive (that is, a noun) or use it as a noun 

noun
  • Part of a text that carries the meaning, such as words and their ordering. 

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