types:
baseball
a ball used in playing baseball
basketball
an inflated ball used in playing basketball
bowl
a wooden ball (with flattened sides so that it rolls on a curved course) used in the game of lawn bowling
football
the inflated oblong ball used in playing American football
golf ball
a small hard ball used in playing golf; dimpled to reduce wind resistance
handball
a small rubber ball used in playing the game of handball
jack
a small ball at which players aim in lawn bowling
marble
a small ball of glass that is used in various games
polo ball
wooden ball that is struck with mallets in playing polo
racquetball
the ball used in playing the game of racquetball
rugby ball
inflated oval ball used in playing rugby
tennis ball
ball about the size of a fist used in playing tennis
volleyball
an inflated ball used in playing volleyball
cue ball
the ball that the billiard player or pool player strikes with his cue
eight ball
a black pool ball bearing the number 8; should be the last to go in certain pool games
object ball
the billiard ball that is intended to be the first ball struck by the cue ball
shooter,
taw
a large marble used for shooting in the game of marbles