How hard a bump are we talking about and which car do you refer to? If it's only a slight bump then each car will probably only have damage to its bumper (fender in the US). But a harder smack may damage the radiator shell or even the radiator itself on the rear car and the boot (trunk) of the front car. A very hard smack might even damage the chassis of one or both cars.
Bumps
small bumps along hairline
Papillae or papilla. It is another word for taste buds. Hope this helped.taste budzes
These bumps are called nodules
the bumps on the moon are called craters which has happened by comets and other objects.
It's a rash.
The red bumps on a turkey's head are called CARUNCLES.
I believe that they slang term for them is "rumblers." Their purpose is to alert you that you are crossing from one lane to another.
They are called milk glands(bumps) prepares baby's milk
Warts
They are called manarilose
osteoderms