Brant is a type of goose, also known as the brant goose. While there may not be many synonyms for this particular bird, there are a few alternative names that can be used. One such name is the Brent goose, which is commonly used in Europe. Another option is the dark-bellied brent goose, which refers specifically to a subspecies of the brant that breeds in Russia. Finally, some people may refer to the brant simply as a black goose, due to its dark plumage. While these synonyms may not be widely used, they can be helpful for identifying and describing this particular species.