eternal sleep vs death

eternal sleep and death both are nouns.

Word	Noun	Adjective	Verb	Adverb
eternal sleep	Yes	No	No	No
death	Yes	No	No	No

As nouns, death is a hypernym of eternal sleep; that is, death is a word with a broader meaning than eternal sleep:

eternal sleep: euphemisms for death (based on an analogy between lying in a bed and in a tomb)
death: the absence of life or state of being dead

eternal sleep (noun)	death (noun)
euphemisms for death (based on an analogy between lying in a bed and in a tomb)	the act of killing
	the event of dying or departure from life
	the permanent end of all life functions in an organism or part of an organism
	the absence of life or state of being dead
	a final state
	the time when something ends
	the time at which life ends; continuing until dead