psychoactive drug vs drug

psychoactive drug and drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychoactive drug	Yes	No	No	No
drug	Yes	No	Yes	No

As nouns, drug is a hypernym of psychoactive drug; that is, drug is a word with a broader meaning than psychoactive drug:

psychoactive drug: a drug that can produce mood changes and distorted perceptions
drug: a substance that is used as a medicine or narcotic

psychoactive drug (noun)	drug (noun)
a drug that can produce mood changes and distorted perceptions	a substance that is used as a medicine or narcotic

psychoactive drug (verb)	drug (verb)
	administer a drug to
	use recreational drugs