collaboration (n.)
- accompaniment
- accordance
- agreement
- alliance
- association
- coaction
- coincidence
- collectivism
- collusion
- combination
- commensalism
- communalism
- communism
- community
- complicity
- concert
- concomitance
- concord
- concordance
- concourse
- concurrence
- confluence
- conjunction
- conspiracy
- cooperation
- cooperativeness
- correspondence
- duet
- ecumenicalism
- ecumenicism
- ecumenism
- esprit
- fellowship
- fraternization
- harmony
- junction
- morale
- mutualism
- mutuality
- octet
- parasitism
- quartet
- quintet
- quislingism
- reciprocity
- sedition
- septet
- sextet
- simultaneity
- solidarity
- symbiosis
- synchronism
- synergism
- synergy
- teamwork
- treason
- trio
- triumvirate
- troika
- union
