| compound(noun, verb, combination, unite, blend) |
| concatenation(noun, combination, amalgamation, merger, unification) |
| concert(verb, participate, cooperate, conspire) |
| conciliation(noun, combination, amalgamation, merger, unification) |
| concord(noun, combination, amalgamation, merger, unification) |
| concurrence(noun, combination, union, meeting, alliance) |
| confederacy(alliance, amalgamation, merger) |
| confederation(combination, union, alliance, amalgamation, merger) |
| confluence(noun, combination, union, meeting, amalgamation) |
| congregation(noun, combination, amalgamation, merger, unification) |
| conjoining(combination, union, amalgamation) |
| conjunction(noun, combination, merger, amalgamation, blending) |
| consolidation(noun, combination, union, alliance, amalgamation) |
| cooperate(verb, participate, conspire) |
| coproduce(verb, participate, cooperate, conspire) |
| correlation(noun, combination, amalgamation, merger, unification) |
| coupling(noun, combination, union, alliance, amalgamation) |
| do business with(verb, expression, idiom, participate, cooperate) |
| doing business with |
| engage in |