What is the name of the Greek underworld?

The Greek underworld is commonly referred to as Hades, named after its ruler, the god Hades himself. In ancient Greek mythology, Hades is not just the name of the god; it is also the term used to describe the entire realm where the souls of the deceased reside. Hades encompasses various regions, including Tartarus, which is a deeper part of the underworld reserved for the wicked, and Elysium, which is a paradise for the virtuous.

This distinction helps illustrate why Hades is the correct answer when referring to the Greek underworld as a whole, unlike Tartarus, Elysium, and Asphodel, which represent specific areas or concepts within that greater context. Tartarus signifies punishment, Elysium represents reward, and Asphodel refers to a neutral zone for ordinary souls, but none of them encapsulate the entire underworld as Hades does.