The phrase "most natant" refers to something that is floating or swimming on the surface of water. There are several synonyms for this term, including buoyant, flotant, floating, and swimming. These words can be used to describe objects or creatures that are effortlessly gliding through the water, such as a leaf on a pond or a school of fish. The term "most natant" is often used in scientific or technical contexts, but can also be applicable in everyday conversation when discussing bodies of water or aquatic life. Regardless of the context, these synonyms capture the essence of something that is gracefully floating or moving through water.