1. (n.) One deputed or authorized to perform the functions of another; a substitute in office; a deputy.

2. (n.) The incumbent of an appropriated benefice.

Grand Penitentiary Holy Father abuna advocate agent alter ego alternate alternative amicus curiae analogy antipope archbishop archdeacon archpriest attorney backup backup man bishop bishop coadjutor canon cardinal cardinal bishop cardinal deacon cardinal priest champion change changeling chaplain coadjutor comparison copy counterfeit curate dean deputy diocesan double dummy ecclesiarch equal equivalent ersatz exarch exchange executive officer exponent fake figurehead fill-in ghost ghostwriter hierarch high priest imitation lieutenant locum locum tenens makeshift metaphor metonymy metropolitan next best thing papa paranymph patriarch penitentiary personnel phony pinch hitter pleader pontiff pope prebendary prelate primate procurator proxy rector relief replacement representative reserves ringer rural dean second in command second string secondary sign spares stand-in sub subdean substituent substitute substitution succedaneum suffragan superseder supplanter surrogate symbol synecdoche third string token understudy utility man utility player vicar general vice vice-president vice-regent vicegerent