arsenous oxide vs arsenous anhydride

arsenous oxide and arsenous anhydride both are nouns.

Word	Noun	Adjective	Verb	Adverb
arsenous oxide	Yes	No	No	No
arsenous anhydride	Yes	No	No	No

As nouns, arsenous oxide and arsenous anhydride are synonyms defined as:

arsenous oxide and arsenous anhydride: a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer

Other synonyms of arsenous oxide include arsenic, arsenic trioxide, ratsbane, white arsenic.

arsenous oxide (noun)	arsenous anhydride (noun)
a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer	a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer