ataractic drug vs tranquillizer

ataractic drug and tranquillizer both are nouns.

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

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

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

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

ataractic drug (noun)	tranquillizer (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