hallucinogenic drug vs psychedelic drug

hallucinogenic drug and psychedelic drug both are nouns.

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

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

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

Other synonyms of hallucinogenic drug include hallucinogen, psychodelic drug.

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