Apollyon vs. Satan — What's the Difference?

The Destroyer; - a name used (Rev. ix. 11) for the angel of the bottomless pit, answering to the Hebrew Abaddon.

Satan, also known as the Devil, and sometimes also called Lucifer in Christianity, is a non-physical entity in the Abrahamic religions that seduces humans into sin or falsehood. In Judaism, Satan is seen as an agent subservient to God or typically regarded as a metaphor for the yetzer hara, or "evil inclination".

In Abrahamic religions, a powerful spiritual being, the tempter and persecutor of humanity, sometimes considered as an angel who rebelled against God and became the Devil.

Alternative form of Satan.

The grand adversary of man; the Devil, or Prince of darkness; the chief of the fallen angels; the archfiend.

(Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell