association, board, brotherhood, chamber, club, college, congress, council, fellowship, fraternity, guild(also gild), institute, institution, league, order, organization, society, sodality

collective, commune, community, cooperativealliance, bloc, camp, coalition, partnershipbody, cadre, groupcircle, clan, clique, coterie, junta, junto, klatch(also klatsch), lot, setcrew, outfit, party, squad, teambranch, chapter, localfaithful, fold, membershipsisterhood, sororitycabal, camarilla, camorra, confederacy, conspiracyband, gang, ringcartel, combine, syndicate