acetic anhydride vs anhydride

acetic anhydride and anhydride both are nouns.

Word	Noun	Adjective	Verb	Adverb
acetic anhydride	Yes	No	No	No
anhydride	Yes	No	No	No

As nouns, anhydride is a hypernym of acetic anhydride; that is, anhydride is a word with a broader meaning than acetic anhydride:

acetic anhydride: a compound that is needed in order to refine opium into heroin
anhydride: a compound formed from one or more other compounds in a reaction resulting in removal of water

acetic anhydride (noun)	anhydride (noun)
a compound that is needed in order to refine opium into heroin	a compound formed from one or more other compounds in a reaction resulting in removal of water