quietus vs eternal sleep

quietus and eternal sleep both are nouns.

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

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

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

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

quietus (noun)	eternal sleep (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)