Hades, Sheol

Definition:

The terms “Hades” (in Greek) and “Sheol” (in Hebrew) are proper names for the place where the spirits of dead people would go after they had died.

In these ancient cultures, people thought of this as an underground dwelling place where the spirits of dead people existed in a shadowy, semi-conscious form.
Although these terms are place names, in the Bible they often mean the same thing as "death" or "the grave."
Throughout most of biblical history, “Sheol” and “Hades” refer to a neutral place where all of the dead go to await judgment, both the righteous and the unrighteous. In the New Testament, however, “Hades” begins to be seen as a place for only the unrighteous, in contrast with “Abraham's side” (Luke 16:22) or “paradise” (Luke 23:43), which describe the place for the righteous.

Both “Sheol” and “Hades” can be translated in various ways, depending on the context. Some possibilities include: “place of the dead,” “place for dead spirits,” “the underworld,” “the pit,” “the grave,” or “death.”
Some translations keep the proper names “Sheol” and “Hades,” spelling them to fit the sound patterns of the language of translation. (See: How to Translate Unknowns).
A phrase could also be added to each term to explain it. Examples of doing this are, “Sheol, place where dead people are” and “Hades, place of death.”

(Translation suggestions: How to Translate Unknowns)