Underparts can be described by a variety of synonyms that are useful for writers and speakers looking to vary their vocabulary. Some alternatives to underparts include lower regions, underside, bottom, belly, and ventrum. Each synonym carries a slightly different connotation, with "belly" suggesting the soft tissue of an animal's abdomen and "ventrum" referring specifically to the underside of an animal's body. "Lower regions" and "underside" are more general terms that can apply to anything from a car's chassis to a building's foundation. By making use of these synonyms, writers can add precision, nuance, and variety to their language when discussing the lower portions of things.