ataraxia vs tranquility

ataraxia and tranquility both are nouns.

Word	Noun	Adjective	Verb	Adverb
ataraxia	Yes	No	No	No
tranquility	Yes	No	No	No

As nouns, tranquility is a hypernym of ataraxia; that is, tranquility is a word with a broader meaning than ataraxia:

Other hypernyms of ataraxia include placidity, quiet, repose, serenity, tranquillity.

ataraxia (noun)	tranquility (noun)
peace of mind	a disposition free from stress or emotion
	a state of peace and quiet
	an untroubled state; free from disturbances