N satan, the Devil, Lucifer, Mephistopheles, Ahriman, Belial, Samael, Zamiel, Beelzebub, the Prince of the Devils, the tempter, the evil one, the evil spirit, the Adversary, the archenemy, the author of evil, the wicked one, the old Serpent, the Prince of darkness, the Prince of this world, the Prince of the power of the air, the foul fiend, the arch fiend, the devil incarnate, the common enemy, the angel of the bottomless pit, Abaddon, Apollyon, fallen angels, unclean spirits, devils, the rulers, the powers of darkness, inhabitants of Pandemonium, demon, diabolism, devilism, devilship, diabolology, satanism, devil worship, manicheism, the cloven foot, satanic, diabolic, devilish, infernal, hellborn, Mythological and other fabulous Deities and Powers.

Also see definition of "apollyon" in Bible Study Dictionaries
For further exploring for "apollyon" in Webster Dictionary Online

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