The hypoionian mode is a musical mode that dates back to ancient Greece and is characterized by a specific combination of pitches. However, there are several other terms that can be used as synonyms for this mode, depending on the context. Some of these include the natural minor mode, the Aeolian mode, and the pure minor mode. These have slight variations in terms of the exact pitches used and the way they are arranged. Other related terms include the Dorian mode, the Phrygian mode, and the Locrian mode. Despite the variations, all of these modes share a basic structure and are important in a wide range of musical traditions.