The term 'Aqua Relative' can be solved by the four-letter word 'TEAL'. TEAL is a color that is a dark blue-green hue, and is a member of the family of colors known as 'aqua relatives'. This family of colors includes shades of blue, green, and turquoise. TEAL is often used to describe the color of the feathers of certain birds, such as ducks and geese. It is also a popular color for clothing, home decor, and other items.