base; bag; sack; fortress; stronghold
first base; first baseman; one fort
earthen walls (of fortification); earthwork; embankment
base stealing; steal; stolen base
fort; fortification; fortress; stronghold
getting on base; reaching first base; times on base; TOB
base; stronghold; main fort; home base; home plate
advance (to the next base)
impregnable fortress; heavily guarded fort
left on base; remnant fort
hit that advances the runner(s)
bases are loaded with no outs
returning to one's base (after a fly ball)
home run king; home run leader