Baluster :: Baluster (n.) A small column or pilaster, used as a support to the rail of an open parapet, to guard the side of a staircase, or the front of a gallery. See Balustrade..
Balustrade :: Balustrade (n.) A row of balusters topped by a rail, serving as an open parapet, as along the edge of a balcony, terrace, bridge, staircase, or the eaves of a building..