magus vs magician

magus and magician both are nouns.

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

As nouns, magician is a hypernym of magus; that is, magician is a word with a broader meaning than magus:

Other hypernyms of magus include necromancer, sorcerer, thaumaturge, thaumaturgist, wizard.

magus (noun)	magician (noun)
a magician or sorcerer of ancient times	one who practices magic or sorcery
a member of the Zoroastrian priesthood of the ancient Persians	someone who performs magic tricks to amuse an audience