antidepressant vs medication

antidepressant and medication both are nouns.

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

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

antidepressant: any of a class of drugs used to treat depression; often have undesirable side effects
medication: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of antidepressant include medicament, medicinal drug, medicine.

antidepressant (noun)	medication (noun)
any of a class of drugs used to treat depression; often have undesirable side effects	the act of treating with medicines or remedies
	(medicine) something that treats or prevents or alleviates the symptoms of disease