The crossword solution for the term 'wood that doesn't burn easily' is ASPEN, a five-letter word. ASPEN is a type of wood that is known for its resistance to fire and is often used in construction and furniture making. It is also popular for its light color and attractive grain pattern. ASPEN is a hardwood, meaning it is denser than softwoods like pine and cedar. This makes it more difficult to ignite and less likely to catch fire.