A spherical body
globe, spheroid, sphere, balloon, orb, perisphere, globule, globular or rounded or spherical or orbicular object, drop, knot, marble, pellet, glob, pill*.
A game played with a ball
baseball, football, catch; see sport 3.
In baseball, a pitch that is not swung at and is not a strike
wild pitch, inside pitch, outside pitch, wide one*, high baby*, duster*, insider*.
Missile for a gun
bullet, shell, lead; see ammunition, shot 2.
grand ball, dance, promenade, reception; see dance 2, party 1.
carry the ball*
assume responsibility, take command, take control, bear the burden; see lead 1, manage 1.
get<strong> <em>or</em> </strong>keep the ball rolling*
have a ball</em> revel, have fun, celebrate; see enjoy oneself, play</em> 1. on the ball*