drug vs inject

drug is a noun but inject is not a noun.

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

As verbs, inject is a hyponym of drug; that is, inject is a word with a more specific, narrower meaning than drug:

Other hyponyms of drug include snort, take a hit, base, free-base, drop, dope.

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

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