eternal sleep vs eternal rest

eternal sleep and eternal rest both are nouns.

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

As nouns, eternal sleep and eternal rest are synonyms defined as:

eternal sleep and eternal rest: euphemisms for death (based on an analogy between lying in a bed and in a tomb)

Other synonyms of eternal sleep include quietus, rest, sleep.

eternal sleep (noun)	eternal rest (noun)
euphemisms for death (based on an analogy between lying in a bed and in a tomb)	euphemisms for death (based on an analogy between lying in a bed and in a tomb)