Hades

(Greek mythology) The god of the underworld and ruler of the dead, son of Cronus and Rhea, brother of Zeus and Poseidon.

(Greek mythology) The underworld, the domain of Hades, by transference from its god.

In the Septuagint Bible, the Greek translation of Sheol.

Hell.

(specifically, chiefly Eastern Orthodoxy) Hell as a waiting place for damned souls before the Last Judgement, after which they may be cast in Gehenna.