hallucinogenic drug vs hallucinogen

hallucinogenic drug and hallucinogen both are nouns.

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

As nouns, hallucinogenic drug and hallucinogen are synonyms defined as:

hallucinogenic drug and hallucinogen: a psychoactive drug that induces hallucinations or altered sensory experiences

Other synonyms of hallucinogenic drug include psychedelic drug, psychodelic drug.

hallucinogenic drug (noun)	hallucinogen (noun)
a psychoactive drug that induces hallucinations or altered sensory experiences	a psychoactive drug that induces hallucinations or altered sensory experiences