methadone vs synthetic heroin

methadone and synthetic heroin both are nouns.

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

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

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

Other synonyms of methadone include dolophine hydrochloride, fixer, methadon, methadone hydrochloride.

methadone (noun)	synthetic heroin (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