agency, agent, alternate, alternative, analogy, backup, backup man, change, changeling, commutation, comparison, copy, counterfeit, delegation, deputation, deputy, deputyship, descendant, displacement, double, dummy, equal, equivalent, ersatz, exchange, fake, fill-in, ghost, ghostwriter, heir, imitation, improvement, inheritor, instauration, locum, locum tenens, makeshift, metaphor, metonymy, next best thing, personnel, phony, pinch hitter, posterity, power of attorney, proxy, quid pro quo, reactivation, reconstitution, reconversion, redintegration, reenactment, reestablishment, reformation, rehabilitation, reinstatement, reinstation, reinstitution, reinvestiture, reinvestment, relief, representation, representative, reserves, restitution, restoration, reversion, ringer, second string, secondary, sign, spares, stand-in, sub, subrogation, substituent, substitute, substitution, succedaneum, successor, supersedence, superseder, superseding, supersedure, supersession, supplantation, supplanter, supplanting, supplantment, surrogate, switch, symbol, synecdoche, third string, tit for tat, token, understudy, utility player, vicar, vicariousness, vice-president, vice-regent