| making substitution(expression, idiom) |
| more than enough(expression, idiom, reserve, subsidiary, supportive) |
| near(extra, auxiliary, supernumerary) |
| other(extra, auxiliary, supernumerary) |
| provisional(extra, auxiliary, supernumerary) |
| proxy(extra, substitute, auxiliary, supernumerary) |
| pseudo(extra, auxiliary, supernumerary) |
| redeemable |
| replacement(extra, auxiliary, supernumerary) |
| reserve(extra, subsidiary, auxiliary, supernumerary, supportive) |
| second(extra, auxiliary, supernumerary) |
| second rate(expression, reserve, subsidiary, supportive) |
| sham(extra, auxiliary, supernumerary) |
| small-fry(reserve, subsidiary, supportive) |
| small fry(expression, reserve, subsidiary, supportive) |
| small time(expression, reserve, subsidiary, supportive) |
| spare(reserve, subsidiary, supportive) |
| standby(reserve, extra, subsidiary, auxiliary, supernumerary) |
| stopgap(extra, auxiliary, supernumerary) |
| subsidiary(reserve, supportive) |