aid
background
bamboo
belt
buoy
circle
device
emergency
equipment
fence
guard
help
life
lifebelt
lifebuoy
lifeguard
lifesaver
marine
nobody
object
outside
preserver
protect
protection
red
rescue
ring
risk
rope
round
safe
safety
save
saver
sea
secure
security
ship
sos
summer
swimming
wall
water
white
wood
wooden