Phoronids are a group of marine animals that live in tubes and are filter feeders. Synonyms for the word "phoronid" include "horseshoe worm", "phoron", and "phoronid worm". These synonyms describe the unique shape of the animal and emphasize its worm-like appearance. Another related term is "tubeworm", which highlights the habitat of the phoronids. The phoronid family is a diverse group of animals with many unique characteristics, so it's important to distinguish them from other tube-dwelling organisms like polychaetes, sipunculans, and bryozoans. Despite the various synonyms used to describe phoronids, they all refer to a fascinating and important group of marine invertebrates.