Search Result for "beelzebub": 
Wordnet 3.0

NOUN (1)

1. (Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell;
[syn: Satan, Old Nick, Devil, Lucifer, Beelzebub, the Tempter, Prince of Darkness]

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5 definitions retrieved:

The Collaborative International Dictionary of English v.0.48:

Beelzebub \Be*el"ze*bub\, n. The title of a heathen deity to whom the Jews ascribed the sovereignty of the evil spirits; hence, the Devil or a devil. See Baal. [1913 Webster]
WordNet (r) 3.0 (2006):

Beelzebub n 1: (Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell [syn: Satan, Old Nick, Devil, Lucifer, Beelzebub, the Tempter, Prince of Darkness]
Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "Beelzebub": Abaddon, Aeshma, Angra Mainyu, Apollyon, Azazel, Belial, Eblis, Lilith, Lucifer, Mephisto, Mephistopheles, Old Nick, Old Scratch, Putana, Sammael, Satan, Shaitan, diablo, fiend, serpent
Easton's 1897 Bible Dictionary:

Beelzebub (Gr. form Beel'zebul), the name given to Satan, and found only in the New Testament (Matt. 10:25; 12:24, 27; Mark 3:22). It is probably the same as Baalzebub (q.v.), the god of Ekron, meaning "the lord of flies," or, as others think, "the lord of dung," or "the dung-god."
Hitchcock's Bible Names Dictionary (late 1800's):

Beelzebub, same as Baalzebub