Gastrotricha refers to a phylum of microscopic aquatic animals found in freshwater and marine environments. Some synonyms of the word 'Gastrotricha' include 'hairy-backs' and 'hairy dwarfs', which describe the physical appearance of these creatures, or 'hairy belly animals', which references their unique ventral cilia. Other synonyms for Gastrotricha include moss animals, wheel animals, and moss piglets, which describe their moss-like appearance and their ability to move like wheels when swimming. Finally, some scientists use the term 'turbellarians' to refer to Gastrotricha, as they exhibit similar characteristics and belong to similar taxonomic groups as flatworms. Despite the various synonyms for Gastrotricha, these organisms remain fascinating creatures that play a crucial ecological role in aquatic ecosystems.