inject vs drug

inject is not a noun while drug is a noun.

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

As verbs, drug is a hypernym of inject; that is, drug is a word with a broader meaning than inject:

Other hypernyms of inject include do drugs.

inject (noun)	drug (noun)
	a substance that is used as a medicine or narcotic

inject (verb)	drug (verb)
give an injection to	administer a drug to
to introduce (a new aspect or element)	use recreational drugs
to insert between other elements
feed intravenously
take by injection
force or drive (a fluid or gas) into by piercing