Soft mud is a type of wet, soft sediment that is composed of clay, silt, and sand particles. It is often found in wetlands, riverbeds, and other areas where water accumulates. The crossword solutions for the term 'soft mud' are SLUDGE (6 letters), OOZE (4 letters), and SLOP (4 letters). SLUDGE is a thick, viscous mixture of water and solid particles, while OOZE is a slow-moving liquid or semi-liquid substance. SLOP is a thin, watery mixture of mud and other materials. All three terms describe different types of soft mud.