propoxyphene vs propoxyphene hydrochloride

propoxyphene and propoxyphene hydrochloride both are nouns.

Word	Noun	Adjective	Verb	Adverb
propoxyphene	Yes	No	No	No
propoxyphene hydrochloride	Yes	No	No	No

As nouns, propoxyphene and propoxyphene hydrochloride are synonyms defined as:

propoxyphene and propoxyphene hydrochloride: a mildly narcotic analgesic drug (trade name Darvon) related to methadone but less addictive

Other synonyms of propoxyphene include Darvon.

propoxyphene (noun)	propoxyphene hydrochloride (noun)
a mildly narcotic analgesic drug (trade name Darvon) related to methadone but less addictive	a mildly narcotic analgesic drug (trade name Darvon) related to methadone but less addictive