Spooky - symbols of Halloween tradition: Pumpkins, Skeletons, movie monsters, bats. Goth stuff like cobwebs, candles, skulls. The tradition of Halloween as modern festival, and these as symbols of that. Defanged from original meanings and just associated with sweets, October etc. Be good children, or the boogieman will get you. The Real Ghostbusters, Ghoul High, Darkstalkers, Marvel Dracula (most of the time), Mickey's Not So Scary Halloween Party. Temporary transformation, curses, nightmares and Glamours.
Horror: Jump scares, folk tales about killers and monsters and death (told with torch under chin can cross this over with spooky). Slasher movies. Gross-out. True crime vibes. Creepy pasta. Vicarious cruelty, vengeance, retribution. Halloween Horror Nights, haunted houses and ghost trains at fairgrounds. Mutilation, dismemberment, body-horror, death, mutation and reanimation.
Supernatural: Rationalisation fantasies - Buffy, the X-Files, the Gothic novel, tales of the unexplained. Dark fantasy where spooky or horror elements replace Tolkienesque tropes as the fictive impositions on otherwise recognisable realities. Twilight. The Twilight Zone (violating the natural order, even if that order may be obscured or unknown, and a return to it - contrast with the vengeance/retributive justice narrative of horror). Witchy full moon occultism. The Craft. The Haunted Mansion. Disease metaphors, infections, symbiosis, sinister lifestyle changes, hidden laws monstrous ecosystems.