antagonist vs drug

antagonist and drug both are nouns.

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

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

antagonist: a drug that neutralizes or counteracts the effects of another drug
drug: a substance that is used as a medicine or narcotic

antagonist (noun)	drug (noun)
a drug that neutralizes or counteracts the effects of another drug	a substance that is used as a medicine or narcotic
a muscle that relaxes while another contracts
someone who offers opposition

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