accompaniment accordance agglomeration agglutination aggregation agreement alliance articulation association bipartisanship bond bracketing cahoots clustering co-working coaction coadjuvancy coadministration coagency cochairmanship codirectorship coincidence collaboration collaborativeness collectivism collectivity collusion combination combined effort commensalism commensality common effort common enterprise communalism communication communism communitarianism community complicity concatenation concert concerted action concomitance concord concordance concourse concurrence confluence congeries conglomeration conjugation conjunction connection consilience conspiracy convergence cooperation cooperativeness copulation correspondence coupling duet duumvirate ecology ecosystem ecumenicalism ecumenicism ecumenism esprit esprit de corps fellow feeling fellowship gathering harmony hookup intercommunication intercourse interlinking joinder joining joining of forces joint effort joint operation jointure junction knotting liaison linkage linking marriage mass action meeting merger merging morale mutual assistance mutualism mutuality octet pairing parasitism pooling pooling of resources pulling together quartet quintet reciprocity saprophytism septet sextet simultaneity solidarity splice symbiotics synchronism synergism synergy team spirit teamwork tie tie-in tie-up trio triumvirate troika unification union united action yoking