Hades vs imaginary place

Hades and imaginary place both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hades	Yes	No	No	No
imaginary place	Yes	No	No	No

As nouns, imaginary place is a hypernym of Hades; that is, imaginary place is a word with a broader meaning than Hades:

Hades: (religion) the world of the dead
imaginary place: a place that exists only in imagination; a place said to exist in fictional or religious writings

Other hypernyms of Hades include fictitious place, mythical place.

Hades (noun)	imaginary place (noun)
(religion) the world of the dead	a place that exists only in imagination; a place said to exist in fictional or religious writings
(Greek mythology) the god of the underworld in ancient mythology; brother of Zeus and husband of Persephone