An example of a racket is the sound of a restaurant server dropping a tray of plates on the ground and all of them breaking.
An example of a racket is fraud or bootlegging.
Power tools work quickly, but they sure make a racket.
With all the racket they're making, I can't hear myself think!
What's all this racket?
An example of a racket is what badminton players use for hitting the birdie back and forth over the net.