The crossword solution for the term 'Word with Wool or Guitar' is STEEL. STEEL is an alloy of iron and carbon, and is one of the most commonly used materials in the world. It is strong, durable, and resistant to corrosion, making it a popular choice for many applications. STEEL is used in the construction of buildings, bridges, and other structures, as well as in the manufacturing of tools, appliances, and automobiles. It is also used in the production of musical instruments such as guitars and violins, and in the production of woolen fabrics.