medication vs therapy

medication and therapy both are nouns.

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

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

medication: the act of treating with medicines or remedies
therapy: (medicine) the act of caring for someone (as by medication or remedial training etc.)

Other hypernyms of medication include treatment.

medication (noun)	therapy (noun)
the act of treating with medicines or remedies	(medicine) the act of caring for someone (as by medication or remedial training etc.)
(medicine) something that treats or prevents or alleviates the symptoms of disease