Hair color refers to the pigmentation of hair and there are many ways to describe it. One synonym for hair color is hair hue, which refers to the shade or color of hair. Another synonym is hair dye, which is used to change the color of hair. Hair tint is another synonym which refers to a subtle change in hair color. Hair shade is another term which describes the natural tone of hair. Hair tone is also a synonym often used to describe hair color. Finally, hair pigment refers to the natural color of hair. These synonyms can be used interchangeably depending on the context and desired effect.