Episkopos is just another Greek word describing one duty of Elders of the Church. Five different words are used to describe the main duties of this office.
“Episkopos is just another Greek word describing one duty of Elders of the Church.”
No. The same root word is used in regard to the replacement of Judas. Thus, the bishop is a successor to an Apostle when most properly understood. Otherwise in the NT the word is used interchangeably with the word presbuteros (elder/priest). Distinctions might have come later - obviously - but that is not out of keeping with the NT.
“Five different words are used to describe the main duties of this office.”
And even so, as I said, in Acts 1 we see the clear link between the office of bishop and Apostle.