cold turkey vs drug withdrawal

cold turkey and drug withdrawal both are nouns.

Word	Noun	Adjective	Verb	Adverb
cold turkey	Yes	No	No	No
drug withdrawal	Yes	No	No	No

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

cold turkey: complete and abrupt withdrawal of all addictive drugs or anything else on which you have become dependent
drug withdrawal: the termination of drug taking

Other hypernyms of cold turkey include withdrawal.

cold turkey (noun)	drug withdrawal (noun)
complete and abrupt withdrawal of all addictive drugs or anything else on which you have become dependent	the termination of drug taking
a blunt expression of views