Phosphorus vs daystar

Phosphorus and daystar both are nouns.

Word	Noun	Adjective	Verb	Adverb
Phosphorus	Yes	No	No	No
daystar	Yes	No	No	No

As nouns, Phosphorus and daystar are synonyms defined as:

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

Other synonyms of Phosphorus include Lucifer, morning star.

Phosphorus (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