In the Bible, the word Satan is an English transliteration of the Hebrew word śāṭān (שָׂטָן), which is a generic noun that means "accuser" or "adversary". It comes from a verb that primarily means "to obstruct" or "to oppose".
The term "Devil" is also used in the Bible to refer to Satan, and comes from the Greek word diabolos, which was used in the Septuagmt (LXX) to translate the Hebrew word śāṭān. The term "Devil" is more frequently used in the writings of the Apostolic and early Greek Fathers.
Hard to tell a story without all the characters.