Orcus

[awr-kuh s] /ˈɔr kəs/
noun
1.
the ancient Roman god of the underworld, identified with the Greek Pluto, or Hades.
2.
the ancient Roman underworld; Hades; Dis.
British Dictionary definitions for Orcus

Orcus

/ˈɔːkəs/
noun
1.
another name for Dis (sense 1)