| coincidence(conjunction, combination, concurrence, accompaniment, aggregation) |
| commerce(noun, business, relation, relationship) |
| communion(noun, support, help, aid, agreement) |
| compact(noun, support, group, agreement, combination) |
| complement(noun, balance, equal, collection, equivalent) |
| complicity(noun, conspiracy) |
| comradeship(noun, friendship, cooperation, companionship, communion) |
| concert(support, help, aid, service, assistance) |
| concomitance(conjunction, combination, accompaniment, aggregation, coexistence) |
| concord(noun, support, agreement, connection, association) |
| consanguinity(noun, support, agreement, connection, association) |
| consolidation(noun, combination, association, union, alliance) |
| contribution(noun, sharing) |
| cotenancy |
| employment(noun, business) |
| engagement(noun, support, agreement, connection, association) |
| fraternization(noun, support, agreement, connection, association) |
| grouping(noun, group, association, union, alliance) |
| guild(noun, organization, company, set, group) |
| holding(noun, business, control, cut, property) |