nightmare (n.)
- bogey
- bogeyman
- bugaboo
- bugbear
- cruciation
- crucifixion
- daydream
- dream
- fantasy
- ghost
- ghoul
- hell
- hobgoblin
- holocaust
- horror
- incubus
- laceration
- martyrdom
- monster
- ogre
- ogress
- passion
- persecution
- phantom
- purgatory
- rack
- revenant
- reverie
- scarecrow
- scarer
- specter
- succubus
- terror
- torment
- torture
- vampire
- vision
- werewolf