attention
background
bad
beware
black
blank
blue
bone
bones
caution
concept
conceptual
copyspace
cross
crossbones
danger
dangerous
dead
death
diamond
die
empty
evil
fatal
hazard
human
icon
kill
lethal
message
orange
piracy
pirate
poison
poisonous
room
scary
sign
skull
space
spooky
square
symbol
threat
toxic
toxin
void
warning
white
yellow