propoxyphene hydrochloride vs propoxyphene

propoxyphene hydrochloride and propoxyphene both are nouns.

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

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

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

Other synonyms of propoxyphene hydrochloride include Darvon.

propoxyphene hydrochloride (noun)	propoxyphene (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