misery vs living death

misery and living death both are nouns.

Word	Noun	Adjective	Verb	Adverb
misery	Yes	No	No	No
living death	Yes	No	No	No

As nouns, living death is a hyponym of misery; that is, living death is a word with a more specific, narrower meaning than misery:

Other hyponyms of misery include concentration camp, suffering, woe.

misery (noun)	living death (noun)
a feeling of intense unhappiness	a state of constant misery
a state of ill-being due to affliction or misfortune