central vs knowledgeable

central

adj
  • Being very important, or key to something. 

  • Having or containing the centre of something. 

  • Being in the centre. 

  • Exerting its action towards the peripheral organs. 

noun
  • centre 

knowledgeable

adj
  • Having knowledge, especially of a particular subject. 

  • Educated and well informed. 

noun
  • A person who has knowledge; an informed party. 

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