antidepressant vs antidepressant drug

antidepressant and antidepressant drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
antidepressant	Yes	No	No	No
antidepressant drug	Yes	No	No	No

As nouns, antidepressant and antidepressant drug are synonyms defined as:

antidepressant and antidepressant drug: any of a class of drugs used to treat depression; often have undesirable side effects

antidepressant (noun)	antidepressant drug (noun)
any of a class of drugs used to treat depression; often have undesirable side effects	any of a class of drugs used to treat depression; often have undesirable side effects