alarm
alert
alertness
athletic
attention
blow
blower
blowing
catcall
coach
competition
concept
control
crime
equipment
exercise
flat
football
foul
game
goal
graphic
icon
illustration
image
isolated
judge
judgment
loud
modern
object
pipe
police
practice
referee
regulation
security
sign
signal
soccer
sound
sport
symbol
tool
toy
trainer
umpire
vector
warning
whistle