endangerment vs instability

endangerment

noun
  • The act of putting someone into danger, or the condition of being in danger. 

  • The exposure of someone, especially a child, to danger or harm. 

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 endangerment and instability occurred in a corpus of books? (source: Google Ngram Viewer )