"Most natatory" is a phrase that refers to a person or animal's ability to swim or their aquatic nature. There are several synonyms that can be used to describe this quality, such as "aquatic," "maritime," "oceanic," "watery," "swimming," "submerged," "subaquatic," "underwater," and "hydrophilic." Each of these words carries a slightly different connotation, but all convey the idea of being well-adapted to the water or having a strong affinity for aquatic environments. By using these synonyms, writers and speakers can add variety and nuance to their descriptions of creatures that are particularly skilled or suited for swimming and other activities in the water.