Elder = Bishop (Titus 1:5-7)

This passage equates the two Greek words, presbuterous (elders) and episkopon (bishop).

Tit 1:5-7 For this reason I left you in Crete, that you would set in order what remains and appoint elders (πρεσβυτέρους) in every city as I directed you, namely, if any man is above reproach, the husband of one wife, having children who believe, not accused of dissipation or rebellion. For the overseer (ἐπίσκοπον) must be above reproach as God’s steward, not self-willed, not quick-tempered, not addicted to wine, not pugnacious, not fond of sordid gain… (NASB)