I think you mean "passing"? Passing is the same as 'bumping', usually from the back row, with your forearms.
walleyball is just bumping a ball against the wall, volleyball is volleying(or bumping) the ball in the air
Bumping a volleyball is the action of passing the ball to a specific spot the court by using your arms as a platform and your legs to give you power.
The basic skills of volleyball are passing (bumping), setting, serving, and hitting.
Setting and bumping
Bumping is clasping your hands together and using the upside of your extended forearms to hit the ball upwards.
Bumping (passing), Setting, and Hitting.
Bumping, setting, and spiking
volleyball is played by either bumping hitting setting and serving the balll across the net
Bumping the volleyball is when you put your hands together and one hand is over the other and there is a little space between your arms and when the ball comes to you, you bend down a little and bump it up.