Synonyms of spook

1 Syllable
spy, spies, ghost, wack
2 Syllables
phantom, scaring, haunters, threaten, alarm, daemons, troubling, haunter, specters, specter, frightens, startle, threatens, trailed, daemon, frighten, bogle, uncalm, kelpie, panic, phantoms, banshee, affright, bogey
3 Syllables
bludgeoning, personae, eidolon, visitant, boogieman, petrify, affrighted, poltergeist, uncalmed, discomfort, horrify, bogeyman, tailgating, unnerve, unnerved, flustered, bludgeoned, terrifies, tailgated, terrify, showboating, unsettle, unnerving, dementing, tailgate, bogeymen, menaced, dragooned
4 Syllables
catenating, terrorize, apparition, catenate, comminate, terrorizing, catenated, terrorized, indispose, accompanied, accompanies, accompany, apparitions
5 Syllables
intimidate, intelligencer