Seam material is a type of fabric used to join two pieces of material together. ORE is a mineral or rock that contains a valuable substance, such as metal, which can be extracted and used for various purposes. ORE is typically mined from the ground and is usually three letters in length. COAL is a combustible black or brownish-black sedimentary rock, formed by the partial decomposition of plant material. It is often used as a fuel source and is four letters in length. Both ORE and COAL are commonly used as seam materials.