| discontinuous(adjective, broken, intermittent, discontinuity) |
| emissary(noun, agent, deputy) |
| flip |
| imitation(noun, extra, substitute, auxiliary, supernumerary) |
| intermit(discontinuity, regularity of recurrence periodicity) |
| locum(noun, supply, reserve, substitute, replacement) |
| pulse(verb, throb, drum, oscillate, palpitate) |
| recurring(adjective, other, regularity of recurrence periodicity) |
| relieve(verb, exchange, switch, replace, swap) |
| replace(verb, change, cover, reduce, turn) |
| sequential |
| shuffle(verb, change, shift, reverse, trade) |
| spare(reserve, subsidiary, supportive) |
| stopgap(adjective, short, limited, replacement, backup) |
| substitution(noun, substitute) |
| tergiversate(verb, pause, hesitate, falter, balk) |
| token(noun, deputy) |
| transpose(verb, change, reduce, turn, diminish) |
| turn(verb, move, change, reduce, diminish) |
| variant(noun, adjective) |