Downward Slope is a term used to describe a gradual decrease in elevation or a decline in an area. The term can be broken down into three words: DECLIVITY (9 letters), DESCENT (7 letters), and DIP (3 letters). DECLIVITY is defined as a downward slope or inclination, while DESCENT is defined as a downward movement or slope. DIP is defined as a sudden or abrupt downward slope. All three terms are used to describe a gradual decrease in elevation or a decline in an area.