priest vs magus

priest and magus both are nouns.

Word	Noun	Adjective	Verb	Adverb
priest	Yes	No	No	No
magus	Yes	No	No	No

As nouns, magus is a hyponym of priest; that is, magus is a word with a more specific, narrower meaning than priest:

priest: a person who performs religious duties and ceremonies in a non-Christian religion
magus: a member of the Zoroastrian priesthood of the ancient Persians

Other hyponyms of priest include Druid, flamen, hoodoo, lama, priest-doctor, shaman, votary.

priest (noun)	magus (noun)
a clergyman in Christian churches who has the authority to perform or administer various religious rites; one of the Holy Orders	a magician or sorcerer of ancient times
a person who performs religious duties and ceremonies in a non-Christian religion	a member of the Zoroastrian priesthood of the ancient Persians