crack cocaine vs cocaine

crack cocaine and cocaine both are nouns.

Word	Noun	Adjective	Verb	Adverb
crack cocaine	Yes	No	No	No
cocaine	Yes	No	No	No

As nouns, cocaine is a hypernym of crack cocaine; that is, cocaine is a word with a broader meaning than crack cocaine:

crack cocaine: a purified and potent form of cocaine that is smoked rather than snorted; highly addictive
cocaine: a narcotic (alkaloid) extracted from coca leaves; used as a surface anesthetic or taken for pleasure; can become powerfully addictive

Other hypernyms of crack cocaine include cocain.

crack cocaine (noun)	cocaine (noun)
a purified and potent form of cocaine that is smoked rather than snorted; highly addictive	a narcotic (alkaloid) extracted from coca leaves; used as a surface anesthetic or taken for pleasure; can become powerfully addictive