noun (n)

• a formal association of people with similar interests(noun.group)

  Synonym:
  club, gild, lodge, order, social club, society
  

  source: wordnet30
• An association of men belonging to the same class, or engaged in kindred pursuits, formed for mutual aid and protection; a business fraternity or corporation; as, the Stationers' Guild; the Ironmongers' Guild. They were originally licensed by the government, and endowed with special privileges and authority.(noun)

  source: webster1913