Epizoon is a term that refers to an animal or insect that lives as a parasite on another animal. Some common synonyms for epizoon include ectoparasite, external parasite, and ectozoon. Other synonyms include parasitic arthropod, vampire, and tick. A few less common synonyms for epizoon include sanguivore, hematophagous arthropod, and louse. While each of these words has a slightly different connotation or emphasis, they all refer to the same basic concept of a creature that lives on another animal, often causing harm or discomfort. Understanding these synonyms can help people better communicate about animal parasites and related topics.