ataraxis vs peace of mind

ataraxis and peace of mind both are nouns.

Word	Noun	Adjective	Verb	Adverb
ataraxis	Yes	No	No	No
peace of mind	Yes	No	No	No

As nouns, ataraxis and peace of mind are synonyms defined as:

Other synonyms of ataraxis include heartsease, peace, peacefulness, repose, serenity.

ataraxis (noun)	peace of mind (noun)
the absence of mental stress or anxiety	the absence of mental stress or anxiety