PCP vs hallucinogenic drug

PCP and hallucinogenic drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
PCP	Yes	No	No	No
hallucinogenic drug	Yes	No	No	No

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

PCP: a drug used as an anesthetic by veterinarians; illicitly taken (originally in the form of powder or `dust') for its effects as a hallucinogen
hallucinogenic drug: a psychoactive drug that induces hallucinations or altered sensory experiences

Other hypernyms of PCP include hallucinogen, psychedelic drug, psychodelic drug.

PCP (noun)	hallucinogenic drug (noun)
a drug used as an anesthetic by veterinarians; illicitly taken (originally in the form of powder or `dust') for its effects as a hallucinogen	a psychoactive drug that induces hallucinations or altered sensory experiences
a person who helps in identifying or preventing or treating illness or disability