combination vs separation

combination

noun
  • The act of combining, the state of being combined or the result of combining. 

  • One or more elements selected from a set without regard to the order of selection. 

  • An association or alliance of people for some common purpose. 

  • A combination shot; a billiard; a shot where the cue ball hits a ball that strikes another ball on the table. 

  • A sequence of numbers or letters used to open a combination lock. 

  • A rapid sequence of punches or strikes in boxing or other combat sports. 

  • A motorcycle and sidecar. 

  • An object formed by combining. 

separation

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

  • 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 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 combination and separation occurred in a corpus of books? (source: Google Ngram Viewer )