drug vs dose

drug and dose both are nouns.

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

As verbs, drug and dose are synonyms defined as:

drug (noun)	dose (noun)
a substance that is used as a medicine or narcotic	a measured portion of medicine taken at any one time
	street name for lysergic acid diethylamide
	the quantity of an active agent (substance or radiation) taken in or absorbed at any one time
	a communicable infection transmitted by sexual intercourse or genital contact

drug (verb)	dose (verb)
administer a drug to	administer a drug to
use recreational drugs	treat with an agent; add (an agent) to