| double(verb, adjective, part, increase, like) |
| reduplicate(verb, duplication) |
| duplicate(verb, adjective, part, increase, like) |
| twin(verb, adjective, increase, like, big) |
| redouble(verb, increase, big, duplication) |
| binary(adjective, part, like, double, similar) |
| dual(adjective, part, like, double, similar) |
| duple(adjective, part, second, burlesqued, dual) |
| duplex(adjective, part, second, dual, twofold) |
| pair(noun, verb) |
| twofold(adjective, part, like, double, identical) |
| biform(adjective, part, double) |
| binate(adjective, second, burlesqued, dual, two) |
| repeat(verb, duplication) |
| replicate |
| bifold(adjective, like, similar, identical, second) |
| bivalent |
| copulate |
| doubled |
| paired(adjective, like, similar, identical, second) |