cathedral vs unofficial

cathedral

noun
  • A large or important church building. 

  • A large, impressive, lofty, and/or important building or place of some other kind. 

  • The principal church of an archbishop's/bishop's archdiocese/diocese which contains an episcopal throne. 

  • A large buttressed structure built by certain termites. 

adj
  • Relating to the throne or the see of a bishop. 

name
  • In certain right-wing conspiracy theories, the mainstream system or establishment of society, held to be liberal or leftist and to be working against the interests of the people or nation, which is both. 

unofficial

adj
  • Not officially established. 

  • Not acting with official authority. 

  • Implicitly true but withheld and/or contradicted by authority. 

  • Not listed in a national pharmacopeia etc. 

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