eternal rest vs quietus

eternal rest and quietus both are nouns.

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

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

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

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

eternal rest (noun)	quietus (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)