Hominoid, also known as great apes or anthropoids, refers to a diverse group of primates that include orangutans, chimpanzees, gorillas, and humans. The antonyms or opposite words for hominoid are, therefore, varied depending on the context. Some antonyms could include animals that are not primates, such as reptiles, birds, or fish. Others could be specific primate types that are not classified as hominoids, such as lemurs or tarsiers. However, it is important to note that the classification of primates is complex and many species blur the lines between different groups, making it challenging to pinpoint clear antonyms for hominoids.