ethical drug vs prescription drug

ethical drug and prescription drug both are nouns.

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

As nouns, ethical drug and prescription drug are synonyms defined as:

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

Other synonyms of ethical drug include prescription, prescription medicine.

ethical drug (noun)	prescription drug (noun)
a drug that is available only with written instructions from a doctor or dentist to a pharmacist	a drug that is available only with written instructions from a doctor or dentist to a pharmacist