The issue with bishop versus presbyter, episcopal v. presbyterian isn't so much etymology. Both words come from Greek words found in scripture.
But there is a lot of tradition that sprung up around the word 'bishop.' The Bible calls church elders bishops, and Paul salutes multiple bishops in Philippi. One of Clement's letters calls elders bishops, also. But at some time in the 2nd century the practice was established of having one of the elders be called the bishop and be over the other elders, with roughly one bishop per city. That's what the episcopal tradition in England drew from. Presbyterianism tended to see elders as equal. But Presbyterianism got messy, and was from the beginning, with adding the extra non-clerical 'elder' office that got confused eventually with the Biblical ordained ministry.
But there is a lot of tradition that sprung up around the word 'bishop.' The Bible calls church elders bishops, and Paul salutes multiple bishops in Philippi. One of Clement's letters calls elders bishops, also. But at some time in the 2nd century the practice was established of having one of the elders be called the bishop and be over the other elders, with roughly one bishop per city. That's what the episcopal tradition in England drew from. Presbyterianism tended to see elders as equal. But Presbyterianism got messy, and was from the beginning, with adding the extra non-clerical 'elder' office that got confused eventually with the Biblical ordained ministry.