boomerang (n.)
- backfire
- backlash
- bola
- bolt
- bounce
- bound
- brickbat
- cannon
- carom
- comeback
- counter
- counterblast
- counterblow
- exchange
- give-and-take
- interchange
- kick
- kickback
- missile
- projectile
- rebound
- rebuff
- reciprocation
- recoil
- repercussion
- reply
- repulse
- resilience
- retaliation
- retort
- return
- ricochet
- rock
- rocket
- spring
- stone
- torpedo
- waddy
