Sandpile, a term that refers to a heap of sand, can be described using various synonyms. Some of the synonyms for sandpile include sandbank, sand heap, sand dune, sand mound, sand drift, and sand hill. These terms are often used interchangeably, depending on the context and nature of the sandpile being referred to. For instance, a sand dune or hill may be used to describe a larger or more complex sand structure in a desert or coastal area. On the other hand, a sand heap or mound may be used for smaller heaps of sand, such as those in a playground or construction site.