[roamer_1]

Acts 20:17,28 presbuteros = elders = episkopos = bishops = poimen = pastors = the same people/functions, namely the elders of Ephesus church. Just a point of info.

episkopos=bishop
presbyteros=elder
diakoneo=deacon
poimen=pastor/shepherd

How do you figure them all to be interchangeable?

[Chaguito]

All words are used by Paul in the same conversation addressed to the same group of men, the elders of the church at Ephesus.