Originally, the word necromantīa referred to a sort of divination using ghosts, like what Odysseus did on his journey home: he made an offering and summoned the shade of Tiresias, in order to ask him questions.
Nowadays, of course, "necromancy" generally refers to manipulating death in other, less savory ways, such as reanimating armies of corpses.
This sort of dark magic is definitely mentioned in Roman literature, such as Lucan's Pharsalia VI:
…Tunc omnis palpitat artus,
tenduntur nerui; nec se tellure cadauer
paulatim per membra leuat, terraque repulsum est
erectumque semel. Distento lumina rictu
nudantur. Nondum facies uiuentis in illo,
iam morientis erat: remanet pallorque rigorque,
et stupet inlatus mundo. Sed murmure nullo
ora astricta sonant: uox illi linguaque tantum
Every limb twitched and shuddered, tendons strained, and the corpse rose up from the ground—not slowly or bit by bit, but standing up all at once, forced out by the earth. Its mouth hung gaping and its eyes were held open: it didn't seem properly alive, more like a person dying. Its deathly pallor and stiffness remained, and it looked dazed from being brought back into the world. But no sound came from its twisted mouth: it had been given a voice and a tongue only to respond[, not to speak for itself].
And Lucan makes it very clear that this sort of corpse-defiling is a dark, unclean sort of magic, not the sort of thing you'd associate with Odysseus and Aeneas.
So: what would a Roman call this type of magic (the dreadful reanimation of corpses, as opposed to Aeneas's civilized catabasis)? Was there ever a specific term used for this?