ghost

angel, daimon, familiar, genie, genius, jinni (or jinn), shaitan

double, doppelgänger (or doppelganger), fetch

lemures, manes

incubus, lamia, succubus, vampire, zombie (also zombi)

cacodemon, demon (or daemon), devil, fiend, ghoul, imp

ace, bit, crumb, dab, driblet, glimmer, hint, little, mite, nip, ounce, particle, peanuts, pin, ray, scrap, scruple, semblance, shade, shadow, shred, skosh, smidgen (also smidgeon), snap, speck, spot, sprinkling, strain, streak, suspicion, touch, trace

memento, remembrance, reminder

artifact

afterimage, aftertaste

balance, corpse, hangover, leftover, oddment, remainder, remnant, scrap

dreg(s), leavings, remain(s), residual, residue, rest

hag [archaic], lamia, vampire

incubus, nightmare, succubus

afreet (or afrit), genie, jinni (or jinn)

apparition, banshee, bogey (also bogie), bugbear, familiar, familiar spirit, genius, phantasm (also fantasm), phantom, poltergeist, shade, shadow, specter (or spectre), spirit, spook, vision, wraith

brownie, dwarf, elf, faerie (also faery), fairy, fay, gnome, goblin, gremlin, hobgoblin, kobold, leprechaun, pixie (also pixy), puck, sprite, troll

monster, ogre