alarm
alert
alertness
appliance
background
building
burning
ceiling
danger
detect
detector
device
dimensional
disaster
domestic
electrical
equipment
fire
flame
home
horizontal
house
household
insurance
life
object
office
plastic
prevention
preventive
protect
protection
rescue
risk
safety
security
sensor
shape
signal
single
siren
smoke
sound
structure
symbol
system
technology
warn
warning
white