Hades, the netherworld (4)
I believe the answer is:
hell
I believe this is a double definition.
'hades' is the first definition.
(synonyms)
'the netherworld' is the second definition.
(synonyms)
(Other definitions for hell that I've seen before include "Unpleasant place" , "Abode of the damned" , "Nasty situation" , "Gehenna" , "Devil's fiery home" .)