Quicksand is a word used to describe a type of wet sand that can trap and engulf people or animals. There are many other words that can be used to describe this phenomenon, such as bog, marshland, swamp, mire, or morass. Each of these words describes a type of terrain that can be dangerous to navigate and can cause sinking or entrapment. Some other synonyms that can be used for quicksand but with slightly different connotations include sinkhole, sump, quagmire, or slough. It is essential to be aware of these synonyms to ensure proper communication and understanding of the terrain and its potential hazards.