What basic color is NOT used to describe a cat's coat?

The basic color that is not used to describe a cat's coat is green. When discussing cat coat colors, typical descriptions include shades like brown, black, and blue, which refer to variations in fur coloration. For instance, "blue" is commonly used in feline terminology to describe a grayish coat, while brown and black are straightforward representations of those respective colors.

Green is not a recognized category for coat colors in cats. This is because animals, including cats, display natural fur colors that fall within a spectrum of browns, blacks, grays, and even whites. While a cat’s eyes can be green, the fur itself does not exhibit a green hue, making this option correct as it doesn’t pertain to coat color classifications used in any standard context for felines.