collectivism (n.)
- centralism
- coaction
- collaboration
- collusion
- commensalism
- communalism
- communion
- communism
- community
- complicity
- concert
- concord
- concordance
- concurrence
- constitutionalism
- cooperation
- cooperativeness
- democracy
- duet
- ecumenicalism
- ecumenicism
- ecumenism
- esprit
- fascism
- federalism
- fellowship
- feudalism
- harmony
- imperialism
- kibbutz
- kolkhoz
- monarchism
- morale
- mutualism
- mutuality
- nationalization
- octet
- pluralism
- quartet
- quintet
- reciprocity
- republicanism
- royalism
- septet
- sextet
- socialism
- solidarity
- symbiosis
- synergism
- synergy
- teamwork
- trio
- triumvirate
- troika
