Stillage is a word that refers to the residue or sediment that remains after a liquid has been filtered or distilled. It can also be used to describe the solid waste or leftover materials from manufacturing processes. There are several synonyms for stillage, including dregs, sediment, lees, and sludge. Other terms that can be used in place of stillage include waste, leftovers, refuse, and debris. When referring specifically to the leftover materials from brewing beer or distilling alcohol, terms like spent grains, mash, and grain bed may also be used. It is important to choose the appropriate synonym depending on the context of the usage.