| pinch-hitter(noun, reserve, replacement, alternative, alternate) |
| procurator(replacement, alternative, alternate, surrogate) |
| refuge(substitute, replacement, alternative, alternate, surrogate) |
| resource(reserve, substitute, replacement, alternative, alternate) |
| servant(noun, aid, assistant, deputy, aide) |
| stopgap(extra, substitute, replacement, alternative, alternate) |
| subordinate(noun, adjective, support, help, aid) |
| subsidiary(adjective, support, lower, spare, inferior) |
| succedaneum(replacement, alternative, alternate, surrogate) |
| succor(noun, support, help, praise, cheer) |
| succour |
| supplanter(replacement, alternative, alternate, surrogate) |
| supplementary(adjective, support, increase, counterfeit, near) |
| temporary(reserve, extra, substitute, replacement, alternative) |
| tentative(extra, auxiliary, supernumerary) |
| utility player(noun, player) |
| vicar(replacement, alternative, alternate, surrogate) |
| vicarious(inferior, extra, minor, subordinate, auxiliary) |
| vice |
| abettor(help, associate, subordinate, representative, assistant) |