Smeltery is a term that refers to a place or facility where metals are melted and refined. The word can be substituted with other synonyms such as foundry, furnace, forge, refinery, and incinerator. Foundry and furnace are the most commonly used alternatives to smeltery as they refer to the same process of melting metals for industrial or commercial use. Refinery refers to the process of purifying different types of crude products. Forge is a specific type of furnace where metals are shaped using hammers and other forging tools. Incinerator refers to an apparatus used for burning waste materials. Different synonyms of smeltery may be used depending on the specific context or industry.