public vs top secret

public

noun
  • The people in general, regardless of membership of any particular group. 

  • A particular group or demographic to be targeted. 

adj
  • Able to be seen or known by everyone; open to general view, happening without concealment. 

  • Officially representing the community; carried out or funded by the state on behalf of the community. 

  • Traded publicly via a stock market. 

  • Open to all members of a community; especially, provided by national or local authorities and supported by money from taxes. 

  • Pertaining to the people as a whole (as opposed to a private group); concerning the whole country, community etc. 

  • Accessible to the program in general, not only to the class or any subclasses. 

top secret

adj
  • Information classified at one of the highest levels of sensitivity by a government, based on an assessment that it would cause exceptionally grave damage to national security if disclosed. 

  • Pertaining to any especially sensitive closed-room activities. 

  • A level of security clearance needed to access such information. 

noun
  • A secret that is classed as "top secret"; top-secret information. 

  • Used other than figuratively or idiomatically: see top, secret. 

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