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home run

third base

second base

two-base hit

bases loaded

first base

three-base hit

base

base stealing

base running

base

third baseman

second baseman

left on base

getting on base

first baseman

base umpire

horst

to get on base

earthen walls (of fortification)

base hit

on base

first-base line

stone fort

third-base line

hit that advances the runner(s)

bulwark

on-base percentage

softball

total bases

home run king

the most home runs

returning to one's base (after a fly ball)

grand slam

bases are loaded with no outs

fortress

leaving the base

impregnable fortress

stronghold

isolated stronghold

rampart

enemy fortress

advance (to the next base)

fort