Stones are a common element in nature and frequently used in construction. Synonyms for stones include rocks, pebbles, boulders, cobbles, and stones. Rocks refer to large, solid masses of mineral matter found on the earth's surface. Pebbles are small, rounded stones often found near water bodies. Boulders are larger than rocks and usually require heavy machinery to move. Cobbles are rock fragments usually around 64-256 millimetres in size. Stone is a general term used to refer to rocks or hard mineral substances used in construction. Regardless of their size or type, these synonyms all refer to natural, earthy materials that play a vital role in building and construction.