一塁[ichirui] first base
一塁手[ichiruishu] first baseman
一塁線[ichiruisen] first-base line
堅塁[kenrui] stronghold
三塁[sanrui] third base

三塁手[sanruishu] third baseman
三塁線[sanruisen] third-base line
三塁打[sanruida] three-base hit
出塁[shutsurui] on base (baseball)