Abaddon n. : The destroyer, or angel of the bottomless pit; -- the same as Apollyon and Asmodeus.

Abaddon n. : Hell; the bottomless pit.

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Taxonomy
Abaddon, Abbaton, the angel, demon, angel, Apollyon, free encyclopedia, Hebrew word, bottomless pit, Satan, the Fallen Angels, the Apocalypse, Dictionary, Revelation, king, mentions, Sheol, Fallen Angels.

Defination from the web:
Abaddon as a place (sheol, hell), not as a spirit or demon or angel. ... Abaddon has also been identified as the angel of death and destruction, demon of the abyss, and chief of demons of the underworld hierarchy, ...