Simians is a term commonly associated with primates and monkeys. As a word, it is sometimes considered outdated and less commonly used than its synonyms. Some synonyms for simians include primates, apes, monkeys, or anthropoids. These terms refer to any animal that falls under the classification of primates. Anthropoids is another synonym for simians, which is derived from the Greek words 'anthropos' meaning human and 'eidos' meaning form. This term includes apes, monkeys, and humans. Overall, these synonyms help to expand the vocabulary for discussing and referencing the diverse range of primates in the animal kingdom.