brick — Bricks are rectangular blocks of baked clay used for building walls, which are usually red or brown. Brick is the material made up of these blocks.
earth — (often initial capital letter) the planet third in order from the sun, having an equatorial diameter of 7926 miles (12,755 km) and a polar diameter of 7900 miles (12,714 km), a mean distance from the sun of 92.9 million miles (149.6 million km), and a period of revolution of 365.26 days, and having one satellite.
mud — wet, soft earth or earthy matter, as on the ground after rain, at the bottom of a pond, or along the banks of a river; mire.
adobe — Adobe is a mixture of mud and straw that is dried into bricks in the sun and used for building, especially in hot countries.