confederation

kənfɛdəˈreɪʃ(ə)n

noun

an organization which consists of a number of parties or groups united in an alliance or league.

a confederation of trade unions

alliance,league,confederacy,federation,association,coalition,combine,consortium,affiliation,conglomerate,cooperative,partnership,fellowship,syndicate,compact,band,group,circle,ring,society,union,consociation,sodality