Bixin is a natural pigment extracted from the seeds of the achiote fruit that is commonly used in the food industry to give a yellow-orange color to certain dishes. However, there are a few other synonyms that can be used to describe this substance. Some of the possible alternatives for bixin are annatto, achiote, or rocou. These words are likely to be more familiar to people who are not in the food industry but may have heard of them being used for colorant purposes. Overall, whether you call it bixin, annatto, achiote, or rocou, it is all referring to the same natural pigment that adds a bright hue to many recipes.