magician vs necromancer

magician and necromancer both are nouns.

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

As nouns, magician and necromancer are synonyms defined as:

Other synonyms of magician include sorcerer, thaumaturge, thaumaturgist, wizard.

magician (noun)	necromancer (noun)
one who practices magic or sorcery	one who practices magic or sorcery
someone who performs magic tricks to amuse an audience	one who practices divination by conjuring up the dead