| co-occurrence |
| coexistence(noun, place, happening, accompaniment) |
| coming together(expression, phrase, merger, coincidence, noun) |
| concert(agreement, harmony) |
| confederacy(noun, association, compact, support, set) |
| conglomeration |
| copulation(noun, junction) |
| federation(noun, agreement, association, compact, support) |
| hookup(noun, association, combination, joining, merger) |
| intercourse(merger, noun, agreement, accord, combination) |
| joinder |
| joint(noun, joining, merger, agreement, link) |
| juncture(noun, joining, merger, agreement, link) |
| liaison(noun, link, connection, accord, tie) |
| pairing |
| parallelism(noun, combination, coincidence, correspondence, concurrence) |
| synthesis(noun, merger, agreement, accord, combination) |
| tie-up(noun, combination, joining, merger, set) |
| unison(noun, harmony, merger, agreement, accord) |
| uniting(noun, merger, agreement, accord, combination) |