Scientific name for sports balls?

[GregO]

i have a taxonomy project for biology and we have to pick 8 things that are closely related and give them two Scientific names. and it has to make sense.so any help would be much appreciated.

Football:
soccer ball:
basketball:
baseball:
softball:
racket ball:
tennis ball:
golf ball:

 

[Voxygen8]

The Latin word for ball is "pila".