hell dust vs diacetylmorphine

hell dust and diacetylmorphine both are nouns.

Word	Noun	Adjective	Verb	Adverb
hell dust	Yes	No	No	No
diacetylmorphine	Yes	No	No	No

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

hell dust: street names for heroin
diacetylmorphine: a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush

Other hypernyms of hell dust include heroin.

hell dust (noun)	diacetylmorphine (noun)
street names for heroin	a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush