The Class Arachnida, which consists of spiders, scorpions, ticks, mites and other eight-legged arthropods, has several synonyms. One synonym of this class is Arachnids, which is a term used to describe all creatures in the class. Another synonym is Arachnoidea, which is often used as an adjective to describe anything related to spiders and their relatives. Additionally, the term Arachnodermatida is used to describe a particular order of arachnids that have unique cuticle structures. Regardless of the term used, arachnids are fascinating and diverse creatures that have captured the curiosity of people for centuries.