A pack horse is an equine that carries items on its back, but what other words can we use to describe this beast of burden? A mule, for example, is a type of pack animal that is often used in rugged terrain due to its sure-footedness and endurance. Another option is a donkey, which is known for its strength and sturdiness. Other synonyms for pack horse include burden bearer, pack animal, and pack mule. Whether you're exploring the desert or the mountains, having a trusty pack horse by your side can make all the difference in your journey.