angel dust vs hallucinogen

angel dust and hallucinogen both are nouns.

Word	Noun	Adjective	Verb	Adverb
angel dust	Yes	No	No	No
hallucinogen	Yes	No	No	No

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

angel dust: a drug used as an anesthetic by veterinarians; illicitly taken (originally in the form of powder or `dust') for its effects as a hallucinogen
hallucinogen: a psychoactive drug that induces hallucinations or altered sensory experiences

Other hypernyms of angel dust include hallucinogenic drug, psychedelic drug, psychodelic drug.

angel dust (noun)	hallucinogen (noun)
a drug used as an anesthetic by veterinarians; illicitly taken (originally in the form of powder or `dust') for its effects as a hallucinogen	a psychoactive drug that induces hallucinations or altered sensory experiences