| quite another thing(expression, idiom) |
| redundant(adjective, extraordinary, new, spare, fresh) |
| replacement(adjective, counterfeit, new, near, reserve) |
| reserve(adjective, extraordinary, new, spare, fresh) |
| secondary(adjective, place, lower, sympathetic, inferior) |
| something else again(expression, idiom) |
| sui generis |
| superfluous(adjective, extraordinary, new, spare, fresh) |
| surrogate(adjective, sympathetic, extra, substitute, alternative) |
| twin(place, lower, inferior, additional, subsequent) |
| ulterior |
| unalike |
| unconventional(adjective, separate, strange, new, special) |
| unequal |
| unnecessary(adjective, extraordinary, new, spare, fresh) |
| unneeded(adjective, extraordinary, new, spare, fresh) |
| unused(adjective, extraordinary, new, spare, fresh) |
| unusual(adjective, separate, strange, new, special) |
| variant |
| virginal(adjective, new, replacement, additional, other) |