morning star vs Lucifer

morning star and Lucifer both are nouns.

Word	Noun	Adjective	Verb	Adverb
morning star	Yes	No	No	No
Lucifer	Yes	No	No	No

As nouns, morning star and Lucifer are synonyms defined as:

morning star and Lucifer: a planet (usually Venus) seen just before sunrise in the eastern sky

Other synonyms of morning star include daystar, Phosphorus.

morning star (noun)	Lucifer (noun)
a planet (usually Venus) seen just before sunrise in the eastern sky	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