| secondary(place, lower, inferior, additional, subsequent) |
| stand-in(noun, adjective, substitute, replacement, alternate) |
| double(noun, place, lower, inferior, substitute) |
| makeshift(noun, adjective, counterfeit, near, reserve) |
| possibility(noun, choice, decision, selection, option) |
| understudy(noun, substitute, replacement, alternate) |
| alternatively |
| discretional(adjective, open, free, voluntary, elective) |
| dummy(noun, extra, substitute, replacement, alternate) |
| elective(adjective, open, free, voluntary, optional) |
| ersatz(extra, crude, auxiliary, substitution, supernumerary) |
| imitation(noun, extra, substitute, auxiliary, supernumerary) |
| recourse(noun, remedy, substitute, replacement, alternate) |
| relief(noun, replacement, alternate, option, recourse) |
| reserve(noun, adjective, counterfeit, spare, near) |
| succedaneum(noun, replacement, alternate, substitution) |
| fill-in(noun, substitute, replacement, alternate, stand-in) |
| substitution(noun, substitute, replacement, substitution) |
| counterfeit(noun, extra, substitute, auxiliary, supernumerary) |
| proxy(noun, extra, substitute, replacement, alternate) |