Superspecies is a term used in biology to describe a group of species that are closely related and share similar characteristics. It is also known as a species complex. There are several synonyms for superspecies, including sibling species, cryptic species, and species aggregates. Sibling species refer to species that are morphologically similar but reproductively isolated from each other. Cryptic species are morphologically similar but genetically distinct. Species aggregates are groups of closely related species that share similar ecological niches. The use of synonyms for superspecies helps to clarify the different ways in which biologists describe and study groups of related organisms.