membership vs partnership

membership

noun
  • The body of members of an organization. 

  • The state of being a member of a group or organization. 

  • The fact of being a member of a set. 

partnership

noun
  • An association of two or more people to conduct a business 

  • The state of being associated with a partner. 

  • The period when two specific batsmen are batting, from the fall of one wicket until the fall of the next; the number of runs scored during this period, 

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