Combustible Heap is a term used to describe a pile of combustible materials, such as wood, paper, or FUEL, that can be set alight. The term can also refer to a pile of combustible materials that are ready to be burned. The crossword solutions for this term are PYRE (4 letters), Pyres (5 letters), and FUEL (4 letters). PYRE is a noun that refers to a large pile of combustible material that is set alight as part of a ritual or ceremony. Pyres is the plural form of the word PYRE. FUEL is a noun that refers to any material that can be burned to produce energy.