peace vs quietude

peace and quietude both are nouns.

Word	Noun	Adjective	Verb	Adverb
peace	Yes	No	No	No
quietude	Yes	No	No	No

As nouns, quietude is a hypernym of peace; that is, quietude is a word with a broader meaning than peace:

Other hypernyms of peace include quietness, tranquility, tranquillity.

peace (noun)	quietude (noun)
a treaty to cease hostilities	a state of peace and quiet
the absence of mental stress or anxiety
the state prevailing during the absence of war
harmonious relations; freedom from disputes
the general security of public places