Ash heap is a term that refers to a pile of ash, usually created by burning waste materials. However, there are many synonyms for this term. One such synonym is ash pile, which is simply another way to describe the same thing. Another synonym is garbage dump or landfill, which is a place where waste is collected and stored. Yet another synonym for ash heap is slag heap, which is a man-made mound of waste material produced during industrial processes. Other synonyms include rubbish heap, refuse pile, and junkyard. All of these terms refer to a place where waste materials are discarded and left to accumulate.