opium vs controlled substance

opium and controlled substance both are nouns.

Word	Noun	Adjective	Verb	Adverb
opium	Yes	No	No	No
controlled substance	Yes	No	No	No

As nouns, controlled substance is a hypernym of opium; that is, controlled substance is a word with a broader meaning than opium:

opium: an addictive narcotic extracted from seed capsules of the opium poppy
controlled substance: a drug or chemical substance whose possession and use are controlled by law

Other hypernyms of opium include narcotic.

opium (noun)	controlled substance (noun)
an addictive narcotic extracted from seed capsules of the opium poppy	a drug or chemical substance whose possession and use are controlled by law