accordance affinity agent agreement alikeness alliance alternate alternative analogy aping approach approximation assimilation backup balance balancing change changeling closeness commensurability community comparability conformity contrast contrasting copy copying correspondence counterfeit deputy double dummy equal equivalent ersatz exchange fake fill-in ghost ghostwriter identity imitation juxtaposing juxtaposition kinship likeness likening locum tenens makeshift match metaphor metonymy mimicking nearness next best thing parallelism parity personnel phony pinch hitter proxy relation relationship relief replacement representative resemblance reserves ringer sameness second string secondary semblance sign similarity simile similitude simulation spares stand-in sub substituent substitute substitution succedaneum superseder supplanter surrogate symbol synecdoche third string token understudy utility player vicar vice-president vice-regent weighing