Lucifer, as stated above, means "light bringer" or "day star" in Latin, which means that it was translated incorrectly later and I THINK that it originally referred to any angel. Beezlebub is a demon, lower than Satan on the hierarchy of demons. I have a book called "Frequently Asked Questions About the Bible" or something like that that answers both of these questions, but I can't find it right now, so this is all from memory.
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