antidepressant drug vs antidepressant

antidepressant drug and antidepressant both are nouns.

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

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

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

antidepressant drug (noun)	antidepressant (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