The term 'CHANGES STATES' can be solved by the word 'MELTS', which is a five-letter word. Melting is a physical change in which a solid substance transitions into a liquid state. This process occurs when the molecules of the solid are heated to a certain temperature, causing them to move faster and further apart, resulting in a liquid form. Melting is an example of a reversible change, meaning that the substance can be returned to its original solid state by cooling it down.