| substitute(noun, verb, adjective, person, change) |
| surrogate(noun, adjective, person, thing, agent) |
| alternative(noun, adjective, counterfeit, near, reserve) |
| backup(noun, adjective, lower, copy, inferior) |
| deputy(noun, adjective, agent, substitute, replacement) |
| vacillate(verb, change, reduce, turn, diminish) |
| change(verb, move, cover, push, return) |
| second(noun, verb, adjective, lower, inferior) |
| stand-in(noun, adjective, person, reserve, agent) |
| understudy(noun, verb, cover, substitute, replacement) |
| vary(verb, move, change, reduce, turn) |
| fluctuate(verb, stop, change, reduce, turn) |
| exchange(noun, verb, trade, substitute, switch) |
| oscillate(verb, stop, change, alter, reach) |
| replacement(noun, adjective, person, reserve, extra) |
| proxy(noun, adjective, cover, reserve, exchange) |
| switch(verb, move, change, cover, push) |
| interchange(verb, change, alter, shift, adjust) |
| stagger(verb, swing, sway, walk, hesitate) |
| shift(verb, move, stop, change, reduce) |