drug abuse vs abuse

drug abuse and abuse both are nouns.

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

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

Other hypernyms of drug abuse include misuse.

drug abuse (noun)	abuse (noun)
excessive use of drugs	improper or excessive use
	cruel or inhumane treatment
	a rude expression intended to offend or hurt

drug abuse (verb)	abuse (verb)
	change the inherent purpose or function of something
	use wrongly or improperly or excessively
	use foul or abusive language towards
	treat badly