The crossword solution for the term 'charcoal alternative' is propane, which is a seven-letter word. Propane is a hydrocarbon gas that is commonly used as a fuel source in many applications. It is a clean-burning fuel that is often used as an alternative to charcoal for grilling and other outdoor cooking activities. Propane is also used in many industrial and commercial applications, such as powering forklifts and providing heat for buildings.