mescaline vs hallucinogen

mescaline and hallucinogen both are nouns.

Word	Noun	Adjective	Verb	Adverb
mescaline	Yes	No	No	No
hallucinogen	Yes	No	No	No

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

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

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

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