arsenous anhydride vs arsenous oxide

arsenous anhydride and arsenous oxide both are nouns.

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

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

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

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

arsenous anhydride (noun)	arsenous oxide (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