PCP vs psychedelic drug

PCP and psychedelic drug both are nouns.

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

As nouns, psychedelic drug is a hypernym of PCP; that is, psychedelic 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
psychedelic drug: a psychoactive drug that induces hallucinations or altered sensory experiences

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

PCP (noun)	psychedelic 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