S: (n) slab (block consisting of a thick piece of something)
S: (n) starting block (block providing bracing for a runner's feet at start of a race)
S: (n) step (a solid block joined to the beams in which the heel of a ship's mast or capstan is fixed)
S: (n) swage block (an iron block cut with holes and grooves to assist in cold working metal)
S: (n) type (a small metal block bearing a raised character on one end; produces a printed character when inked and pressed on paper) "he dropped a case of type, so they made him pick them up"