central vs relative

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 

relative

adj
  • Relevant; pertinent; related. 

  • Expressed in relation to another item, rather than in complete form. 

  • Having the same key but differing in being major or minor. 

  • Connected to or depending on something else; comparative. 

  • Depending on an antecedent; comparative. 

  • Capable to be changed by other beings or circumstance; conditional. 

noun
  • A type of adjective that inflects like a relative clause, rather than a true adjective, in certain Bantu languages. 

  • Someone in the same family; someone connected by blood, marriage, or adoption. 

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