General:
* Bicolor: This is the most common and direct word for something with two colors.
* Bichromatic: This word is more scientific and often used in contexts like art or photography.
* Two-toned: This describes something having two distinct colors, especially when they are contrasting.
Specific:
* Duotone: This refers to an image or photograph that is printed or displayed using only two colors (usually black and white or a color and its complementary color).
* Parti-colored: This describes something that is partly colored one way and partly colored another way.
* Variegated: This implies that the two colors are mixed or intermingled, creating a pattern or a blended effect.
The best word to use will depend on the specific context and what you want to emphasize.