CONCRETE n.
A mixture of gravel, pebbles, or broken stone with cement or with tar, etc., used for sidewalks, roadways, foundations, etc., and esp. for submarine structures.
PAVEMENT n.
id material, laid so as to make a hard and convenient surface for travel; a paved road or sidewalk; a decorative interior floor of tiles or colored bricks. The riches of heaven's pavement, trodden gold. Milton. Pavement teeth (Zoöl.), flattened teeth which in certain fishes, as the skates and cestracionts, are arranged…