Finding the right synonym for the word "animal feeder" depends on the type of animals being fed. For livestock, the term is often referred to as a "livestock feeder" or "livestock trough." A "hayrack" or "manger" is used for feeding horses and other equines. For wild birds, a "bird feeder" or "birdhouse" is commonly used. "Feeding dish" or "feeding station" are also synonymous with "animal feeder" and can be used for a wide range of animals, including dogs, cats, and rodents. Ultimately, the right synonym for "animal feeder" will depend on the context and specific needs of the animals being fed.