The word "lyssa" is a rare term that refers to the disease of rabies in animals. However, there are several synonyms that can be used instead of "lyssa" to describe this deadly condition. Some common synonyms for "lyssa" include "rabies," "hydrophobia," and "madness." Additionally, "canine distemper" and "feline distemper" are sometimes used as synonyms for "lyssa" to describe similar diseases that affect dogs and cats. While these terms may not be as well-known as "lyssa," they are helpful for accurately describing and identifying this dangerous condition in animals.