tranquillizer vs ataractic agent

tranquillizer and ataractic agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
tranquillizer	Yes	No	No	No
ataractic agent	Yes	No	No	No

As nouns, tranquillizer and ataractic agent are synonyms defined as:

tranquillizer and ataractic agent: a drug used to reduce stress or tension without reducing mental clarity

Other synonyms of tranquillizer include antianxiety agent, ataractic, ataractic drug, tranquilizer, tranquilliser.

tranquillizer (noun)	ataractic agent (noun)
a drug used to reduce stress or tension without reducing mental clarity	a drug used to reduce stress or tension without reducing mental clarity