| imitation(noun, extra, substitute, auxiliary, supernumerary) |
| sub(noun, person, thing, informal, agent) |
| substitution(noun, substitute) |
| vicarious(adjective, extra, auxiliary, another, done) |
| dummy(noun, supply, extra, agent, substitute) |
| factor(noun, agent, representative, assistant, operative) |
| resource(noun, person, thing, supply, reserve) |
| secondary(adjective, sympathetic, deputy, secondhand, mediated) |
| succedaneum(noun, supply, agent, replacement, alternative) |
| acting(adjective, extra, substitute, acting, temporary) |
| change(noun, break, advance, turn, development) |
| counterfeit(noun, extra, substitute, auxiliary, supernumerary) |
| envoy(noun, agent, substitute, representative, operative) |
| expediency(noun, person, thing, supply, substitute) |
| foster |
| ghost(noun, supply, agent, replacement, alternative) |
| go-between(noun, agent, representative, operative, manager) |
| intermediary(noun, agent, substitute, representative, operative) |
| locum(noun, supply, agent, substitute, replacement) |
| locum tenens(expression, idiom, supply, agent, replacement) |