Dichromatic vision refers to the ability to see only two colors. However, there are several synonyms that can be used to describe this condition. Some of the common alternatives include dichromacy, which is the medical term for dichromatic vision, and color blindness. Other synonyms for this condition include incomplete color vision, partial color blindness, and dichromatism. While these terms can be used interchangeably, it is important to note that not all cases of color blindness are dichromatic - some people may have trouble distinguishing between certain colors, while others may not be able to see any colors at all.