alarm

alert

blast

blues

bunker

burst

buzzer

call

decay

deep

distress

drone

echo

emergency

foreboding

fortification

freight

french

fright

hall

harp

horn

horror

instrument

large

long

loud

mouth

musical

organ

panic

passage

railroad

reverberant

scary

shaft

shelter

signal

sinister

siren

sound

southern

sudden

sustained

tail

tension

trouble

underground

unexpected

warning