Simiiforme is a term used in biological taxonomy to refer to the primate suborder that includes monkeys, apes, and humans. Interestingly, there are several synonyms for this term that are used in different contexts. One common alternative is Anthropoidea, which refers specifically to the simiiforme suborder without the tarsiers. Another synonym is Haplorhini, which includes simiiforme and tarsiers as well as some extinct primates. Another term used is Platyrrhini, which specifically refers to New World monkeys. It's important to note that these terms may not be interchangeable and may have slightly different implications in certain contexts. Nevertheless, they all refer to the same broad taxonomic group of primates that are defined by their characteristics and evolutionary history.