| understudy |
| accompaniment(noun, music, part, performer) |
| back up(verb, phrasal verb) |
| backup |
| different(adjective, other, alternate) |
| druthers(noun, substitute, replacement, alternative, opportunity) |
| other(noun, adjective, substitute, replacement, alternative) |
| other fish in sea(noun, expression, idiom, substitute, replacement) |
| other fish to fry(noun, expression, idiom, substitute, replacement) |
| possible choice(noun, expression, substitute, replacement, opportunity) |
| recourse(noun, substitute, replacement, opportunity, substitution) |
| redundancy(noun, substitute, replacement, opportunity, substitution) |
| sub(noun, substitute, replacement, opportunity, substitution) |
| take it or leave it(noun, expression, idiom, substitute, replacement) |
| alternate(adjective, other, flipside) |
| alternative(substitute, replacement, other, substitution, flipside) |
| another(adjective, other) |
| another course of action(expression, idiom, substitute, replacement, substitution) |
| another possibility(expression, substitute, replacement, substitution) |
| back(noun, part) |