psilocyn vs psychedelic drug

psilocyn and psychedelic drug both are nouns.

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

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

psilocyn: a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin.
psychedelic drug: a psychoactive drug that induces hallucinations or altered sensory experiences

Other hypernyms of psilocyn include hallucinogen, hallucinogenic drug, psychodelic drug, alkaloid.

psilocyn (noun)	psychedelic drug (noun)
a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin.	a psychoactive drug that induces hallucinations or altered sensory experiences