alien

bug

cockroach

crawly

creature

creepy

crypt

damned

dark

demonic

den

dragon

dungeon

eerie

evil

fantasy

fear

fright

ghastly

gothic

gremlin

growling

halloween

horrific

horror

imaginary

insect

insectoid

life-form

menacing

monster

myth

mythical

nightmare

organism

pest

roar

scary

snarling

spider

spooky

strange

supernatural

terrifying

terror

thriller

troll

twilight

undead

wild

growl

life form

snarl