So far as I know, today and for the past 2000 years anyway, the word for priest in Greek (other than παπας) is ἱερεύς, with small spelling variations over the centuries.
Πρεσβευτερος, I think, means either an old man or a representative, though we do call the wife of a priest a πρεσβευτερα. Certainly in English, though, we call priests Presbyters.