hoop,
This is the way MLB looks at them.
WILD PITCHES - PASSED BALLS
10.15
(a) A wild pitch shall be charged when a legally delivered ball is so high, or so wide, or so low that the catcher does not stop and control the ball by ordinary effort, thereby permitting a runner or runners to advance. (1) A wild pitch shall be charged when a legally delivered ball touches the ground before reaching home plate and is not handled by the catcher, permitting a runner or runners to advance. (b) A catcher shall be charged with a passed ball when he fails to hold or to control a legally pitched ball which should have been held or controlled with ordinary effort, thereby permitting a runner or runners to advance.