different between methadone vs oxymorphone

English

From (di)meth(yl)a(mino) +? d(iphenyl) +? (heptan)one.

methadone (countable and uncountable, plural methadones)

(pharmacology) A powerful synthetic analgesic drug which is similar to morphine in its effects but less sedative and is used as a substitute drug in the treatment of morphine and heroin addiction.

“methadone”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.
“methadone”, in Merriam–Webster Online Dictionary, (Please provide a date or year).

From (hydr)oxy +? (dihydro)morph(ine) +? -one.

oxymorphone (uncountable)

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