Buffel duck is a specific species of duck, and as such, there are no true antonyms for the term. However, if we look at the word 'buffel,' which refers to the bird's buff-colored plumage, we could suggest antonyms such as white, black, or brown, which are all colors that are often applied to birds' feathers. Alternatively, we could look for antonyms of the word 'duck,' which might include terms such as predator, prey, or flightless. While these words are not direct antonyms for 'buffel duck,' they do provide us with alternative terms that can be used when discussing birds or the natural world.