1 Peter 5:8 Be sober, be vigilant; because your ADVERSARY the devil, as a roaring lion, walketh about, seeking whom he may devour:
Revelation 12:10 ...for the accuser of our brethren is cast down, which accused them before our God day and night.
So maybe your word etymology is the only consideration for word meaning, but sometimes that approach fails to take into consideration the CONTEXT of the topic. In proper Biblical analysis - context reigns supreme to word usage, individual words do not stand outside of context, but must be within contextual meaning.
I go only according to Torah so any verses from the Christian Bible have no meaning to me.
The Christian view of Satan has been taken out of context from the Hebrew Scriptures.
Do the research and you will discover that Satan DOES mean prosecutor.
The devil and Hell are pagan ideas,as is the idea that G-d has an adversary of similar powers and authority.