downer vs sedative drug

downer and sedative drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
downer	Yes	No	No	No
sedative drug	Yes	No	No	No

As nouns, downer and sedative drug are synonyms defined as:

downer and sedative drug: a drug that reduces excitability and calms a person

Other synonyms of downer include depressant, sedative.

downer (noun)	sedative drug (noun)
a drug that reduces excitability and calms a person	a drug that reduces excitability and calms a person