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WORDNET DICTIONARY
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OXFORD DICTIONARY
THESAURUS
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WORDNET DICTIONARY

Noun spook has 2 senses

• spook(n = noun.person) creep, weirdie, weirdo, weirdy - someone unpleasantly strange or eccentric; Array
is a kind of disagreeable person, unpleasant person

• spook(n = noun.cognition) ghost, shade, specter, spectre, wraith - a mental representation of some haunting experience; "he looked like he had seen a ghost"; "it aroused specters from his past"
is a kind of apparition, fantasm, phantasm, phantasma, phantom, shadow
Derived form verb spook₁

Verb spook has 1 sense

• spook(v = verb.emotion) Array - frighten or scare, and often provoke into a violent action; "The noise spooked the horse"
is one way to affright, fright, frighten, scare
Derived form noun spook₂
Sample sentence:
The performance is likely to spook Sue

CIDE DICTIONARY

OXFORD DICTIONARY

THESAURUS

spook

Masan, affright, agent, agitate, alarm, apparition, appearance, astral, astral spirit, awe, banshee, bogey, bug, case, character, control, convulse, curdle the blood, departed spirit, discompose, disembodied spirit, disquiet, distract, disturb, duck, duppy, dybbuk, eidolon, embroil, form, fright, frighten, funk, ghost, grateful dead, guide, hant, haunt, horripilate, idolum, immateriality, incorporeal, incorporeal being, incorporeity, larva, lemures, make one tremble, manes, materialization, obsess, oddball, oddity, oni, original, perturb, phantasm, phantasma, phantom, poltergeist, possess, presence, psych, quiz, raise apprehensions, revenant, scare, shade, shadow, shake, shape, shrouded spirit, specter, spectral ghost, spirit, sprite, spy, stagger, startle, terrify, terrorize, theophany, throw, throw into confusion, trouble, undercover man, unman, unnerve, unsettle, unstring, unsubstantiality, upset, vision, walking dead man, wandering soul, wraith, zombie

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spook

Demon

N demon, daemon, demonry, demonology, evil genius, fiend, familiar, daeva, devil, bad spirit, unclean spirit, cacodemon, incubus, Eblis, shaitan, succubus, succuba, Frankenstein's monster, Titan, Shedim, Mephistopheles, Asmodeus, Moloch, Belial, Ahriman, fury, harpy, Friar Rush, vampire, ghoul, afreet, barghest, Loki, ogre, ogress, gnome, gin, jinn, imp, deev, lamia, bogie, bogeyman, bogle, nis, kobold, flibbertigibbet, fairy, brownie, pixy, elf, dwarf, urchin, Puck, Robin Goodfellow, leprechaun, Cluricaune, troll, dwerger, sprite, ouphe, bad fairy, nix, nixie, pigwidgeon, will-o'-the wisp, ghost, revenant, specter, apparition, spirit, shade, shadow, vision, hobglobin, goblin, orc, wraith, spook, boggart, banshee, loup-garou, lemures, evil eye, merman, mermaid, merfolk, siren, satyr, faun, manito, manitou, manitu, possession, demonic possession, diabolic possession, insanity, Maxwell's demon, demoniac, demonic, demonical, impish, demoniacal, fiendish, fiend-like, supernatural, weird, uncanny, unearthly, spectral, ghostly, ghost-like, elfin, elvin, elfish, elflike, haunted, pokerish, possessed, possessed by a devil, possessed by a demon, demonically.

For further exploring for "spook" in Webster Dictionary Online