One of the most common synonyms for "bean protein" is "legume protein." This is because most beans are classified as legumes, which include lentils, peas, and chickpeas. Another option is to use the term "vegan protein," which implies that the protein source is plant-based and free of animal products. For those who want to be more specific, they could use terms like "soy protein" (which is found in soybeans) or "pea protein" (which is found in peas). Lastly, one could simply use the term "plant-based protein" to encompass all sources of protein that come from plants, including beans, nuts, and seeds.