The term 'Vary Between' can be summarized by the crossword solution 'RANGE', which is a 5-letter word. RANGE is a term used to describe the difference between two extremes, such as the highest and lowest values of a set of numbers or the earliest and latest dates of an event. It is also used to describe the area in which something exists or occurs. For example, a species may have a RANGE of habitats in which it can survive, or a product may have a RANGE of prices.