establishment vs instability

establishment

noun
  • That which is established; as a form of government, a permanent organization, business or force, or the place where one is permanently fixed for residence. 

  • The ruling class or authority group in a society; especially, an entrenched authority dedicated to preserving the status quo. Also Establishment. 

  • The number of staff required to run a department or organisation (often used in the context of healthcare and other public services). 

  • The act of establishing; a ratifying or ordaining; settlement; confirmation. 

  • The state of being established, founded, etc.; fixed state. 

instability

noun
  • The quality of being unstable. 

  • A state that is not in equilibrium, or in which a small change has a large irreversible effect. 

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