computer network vs cyberspace

computer network

noun
  • A group of computers that use a set of common communication protocols over digital interconnections for the purpose of sharing resources located on or provided by the network nodes. 

cyberspace

noun
  • A three-dimensional representation of virtual space in a computer network. 

  • A world of information accessed through the Internet. 

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