nefazodone vs antidepressant

nefazodone and antidepressant both are nouns.

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

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

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

Other hypernyms of nefazodone include antidepressant drug.

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