withdrawer vs drug addict

withdrawer and drug addict both are nouns.

Word	Noun	Adjective	Verb	Adverb
withdrawer	Yes	No	No	No
drug addict	Yes	No	No	No

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

Other hypernyms of withdrawer include junkie, junky.

withdrawer (noun)	drug addict (noun)
a depositor who withdraws funds previously deposited	a narcotics addict
a student who withdraws from the educational institution in which he or she was enrolled
a contestant who withdraws from competition
a drug addict who is discontinuing the use of narcotics
an individualist who withdraws from social interaction
an authority who withdraws permission