Lucifer vs Beelzebub

Lucifer and Beelzebub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lucifer	Yes	No	No	No
Beelzebub	Yes	No	No	No

As nouns, Lucifer and Beelzebub are synonyms defined as:

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

Other synonyms of Lucifer include Devil, Old Nick, Prince of Darkness, Satan, the Tempter.

Lucifer (noun)	Beelzebub (noun)
a planet (usually Venus) seen just before sunrise in the eastern sky	(Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell
(Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell