combine vs separation

combine

noun
  • Especially, a joint enterprise of whatever legal form for a purpose of business or in any way promoting the interests of the participants, sometimes with monopolistic or fraudulent intentions. 

  • An artwork falling between painting and sculpture, having objects embedded into a painted surface. 

  • An industrial conglomeration in a socialist country, particularly in the former Soviet bloc. 

  • A Test match in which applicants play in the hope of earning a position on a professional football team. 

  • A combine harvester 

verb
  • To have two or more things or properties that function together. 

  • In the game of casino, to play a card which will take two or more cards whose aggregate number of pips equals those of the card played. 

  • To come together; to unite. 

  • To bring (two or more things or activities) together; to unite. 

separation

noun
  • An agreement legalizing such an arrangement. 

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

  • 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. 

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