quietus vs eternal rest

quietus and eternal rest both are nouns.

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

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

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

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

quietus (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)