| locum(supply, agent, replacement, alternative, alternate) |
| makeshift(supply, extra, agent, substitute, replacement) |
| mediator(noun, agent, voice, representative, manager) |
| medium(noun, agency) |
| minister(noun, agent, representative, assistant, operative) |
| mock(extra, auxiliary, supernumerary) |
| mouthpiece(noun, deputy) |
| nominee(noun, deputy) |
| plenipotentiary |
| proctor(noun, representative, operative, manager, deputy) |
| provisional(extra, auxiliary, supernumerary) |
| relief(replacement, alternative, alternate, backup, surrogate) |
| replace(verb, exchange, switch, swap, interchange) |
| representation |
| spokesperson(noun, agent, voice, representative, member) |
| stopgap(supply, extra, agent, substitute, replacement) |
| subordinate(noun, assistant) |
| succedaneum(supply, agent, replacement, alternative, alternate) |
| supplant(verb, exchange, switch, replace, swap) |
| supplanter(supply, agent, replacement, alternative, alternate) |