A box of fire can refer to various things, and it can have several synonyms. Some common synonyms include fire pit, bonfire, hearth, blaze, flame, inferno, furnace, and incinerator. A fire pit is an outdoor structure typically used for bonfires. A bonfire typically refers to a large outdoor fire for warmth, cooking, or entertainment. A hearth is a fireplace or similar structure used for heating a room. A blaze is a bright, intense fire. An inferno is an uncontrollable firestorm. A furnace is a heating system that uses fuel to generate heat. An incinerator is a device used for burning waste materials. Therefore, it depends on the context in which the term "box of fire" is used to determine the best synonym.