mescaline vs psychodelic drug

mescaline and psychodelic drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
mescaline	Yes	No	No	No
psychodelic drug	Yes	No	No	No

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

mescaline: the hallucinatory alkaloid that is the active agent in mescal buttons
psychodelic drug: a psychoactive drug that induces hallucinations or altered sensory experiences

Other hypernyms of mescaline include hallucinogen, hallucinogenic drug, psychedelic drug.

mescaline (noun)	psychodelic drug (noun)
the hallucinatory alkaloid that is the active agent in mescal buttons	a psychoactive drug that induces hallucinations or altered sensory experiences