ethical drug vs refill

ethical drug and refill both are nouns.

Word	Noun	Adjective	Verb	Adverb
ethical drug	Yes	No	No	No
refill	Yes	No	Yes	No

As nouns, refill is a hyponym of ethical drug; that is, refill is a word with a more specific, narrower meaning than ethical drug:

ethical drug: a drug that is available only with written instructions from a doctor or dentist to a pharmacist
refill: a prescription drug that is provided again

ethical drug (noun)	refill (noun)
a drug that is available only with written instructions from a doctor or dentist to a pharmacist	a commercial product that refills a container with its appropriate contents
	a prescription drug that is provided again

ethical drug (verb)	refill (verb)
	fill something that had previously been emptied