separation vs subordination

separation

noun
  • Departure from active duty, while not necessarily leaving the service entirely. 

  • An agreement legalizing such an arrangement. 

  • An object that separates two spaces. 

  • The act of disuniting two or more things, or the condition of being separated. 

  • The act or condition of two or more people being separated from one another. 

  • The place at which a division occurs. 

  • An interval, gap or space that separates things or people. 

  • The act or condition of a married couple living in separate homes while remaining legally married. 

subordination

noun
  • The process of subordinating. 

  • The quality of being properly obedient to a superior (as a superior officer). 

  • The process of making something subordinate. 

  • The property of being subordinate; inferiority of rank or position. 

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