The term SMELTER INPUT refers to the materials that are used as inputs in the smelting process. The most common inputs are ores, which are rocks or minerals from which a metal or valuable mineral can be extracted. Ores are typically composed of four letters, such as ORES. ORE is a three letter word for a rock or mineral from which a metal or valuable mineral can be extracted. Iron ORE is a seven letter word for a type of ORE that contains iron and is used in the smelting process.