tranquilliser vs ataractic agent

tranquilliser and ataractic agent both are nouns.

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

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

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

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

tranquilliser (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