synthetic heroin vs methadon

synthetic heroin and methadon both are nouns.

Word	Noun	Adjective	Verb	Adverb
synthetic heroin	Yes	No	No	No
methadon	Yes	No	No	No

As nouns, synthetic heroin and methadon are synonyms defined as:

synthetic heroin and methadon: synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction

Other synonyms of synthetic heroin include dolophine hydrochloride, fixer, methadone, methadone hydrochloride.

synthetic heroin (noun)	methadon (noun)
synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction	synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction