Endozoa refers to a group of animals that live and reproduce mainly within their hosts. Some synonyms for endozoa include endoparasites, endocommensals, and endosymbionts. Endoparasites are organisms that live within another organism, causing harm to the host. Examples include tapeworms and liver flukes. Endocommensals are organisms that live within another organism without harming it, like the gut microbiome. Finally, endosymbionts are organisms that live in a mutually beneficial relationship with another organism, for example, mitochondria living within animal cells. While these terms are all synonyms for endozoa, they can refer to different types of relationships between the host and the endozoa.