The term GUNPOWDER ELEMENT can be solved by the crossword solution SULFUR, which is a chemical element with the atomic number 16 and symbol S. It is an abundant, multivalent non-metal. SULFUR is an essential element for life and is found in two amino acids, cysteine and methionine. It is also found in proteins, vitamins, and enzymes. SULFUR is used in the production of sulfuric acid, which is used in many industrial processes.