| double(noun, adjective, part, double, duplication) |
| duplicate(noun, adjective, part, spare, double) |
| dual(adjective, part, double, accompaniment, second) |
| twin(noun, adjective, spare, double, identical) |
| twofold(adjective, part, spare, equal, double) |
| binary(adjective, part, double, accompaniment, second) |
| duple(adjective, part, spare, equal, double) |
| bilateral(adjective, double, duplication) |
| second(noun, adjective, double, duplication, dual) |
| dualistic(adjective, spare, equal, double, identical) |
| dyadic(adjective, double, accompaniment) |
| two(noun, adjective, double, duplication, accompaniment) |
| bipartite |
| duplex house(noun, expression, idiom) |
| geminate(adjective, part, second, dual, twofold) |
| bidirectional |
| bifacial |
| biform(adjective, part, duplication) |
| binate(adjective, accompaniment, second, dual, twofold) |
| double-faced(adjective, double, duplication) |