Serzone vs antidepressant drug

Serzone and antidepressant drug both are nouns.

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

As nouns, antidepressant drug is a hypernym of Serzone; that is, antidepressant drug is a word with a broader meaning than Serzone:

Serzone: an antidepressant drug (trade name Serzone)
antidepressant drug: any of a class of drugs used to treat depression; often have undesirable side effects

Other hypernyms of Serzone include antidepressant.

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