A slippery substance is a material that has a low coefficient of friction, meaning it is difficult to grip and can cause objects to slide easily. The three solutions for this term are LUBE (4 letters), TEFLON (6 letters), and OIL (3 letters). LUBE is a lubricant used to reduce friction between two surfaces, while Teflon is a synthetic polymer known for its non-stick properties. OIL is a viscous liquid derived from petroleum that is used as a lubricant and fuel.