morning star vs daystar

morning star and daystar both are nouns.

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

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

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

Other synonyms of morning star include Lucifer, Phosphorus.

morning star (noun)	daystar (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