| combining(adjective, joint, harmonious, united, shared) |
| common(adjective, joint, harmonious, interchangeable, united) |
| communal(adjective, common, joint, public, shared) |
| commutual(adjective, interchangeable, opposite, proportionate, homologous) |
| completory(adjective, interchangeable, opposite, proportionate, homologous) |
| concerted(adjective, joint, harmonious, united, shared) |
| concomitant(adjective, similar, collateral, attendant, linked) |
| concordant(adjective, collateral, interchangeable, attendant, proportionate) |
| concurring(adjective, joint, harmonious, united, shared) |
| confederated(adjective, involved, touching, united, linked) |
| conjunct(adjective, common, joint, public, interchangeable) |
| connate(adjective, similar, linked, relevant, connected) |
| connatural(adjective, similar, linked, relevant, connected) |
| consanguine(adjective, similar, linked, relevant, connected) |
| convertible(adjective, common, similar, joint, public) |
| cooperational(adjective, correlational) |
| coordinate(adjective, joint, interchangeable, proportionate, homologous) |
| coordinated(adjective, joint, harmonious, united, shared) |
| correlational(adjective, correlational) |
| correspondent(adjective, similar, interchangeable, opposite, proportionate) |