antianxiety agent vs tranquilliser

antianxiety agent and tranquilliser both are nouns.

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

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

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

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

antianxiety agent (noun)	tranquilliser (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