arsenous oxide vs arsenic trioxide

arsenous oxide and arsenic trioxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
arsenous oxide	Yes	No	No	No
arsenic trioxide	Yes	No	No	No

As nouns, arsenous oxide and arsenic trioxide are synonyms defined as:

arsenous oxide and arsenic trioxide: 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, arsenous anhydride, ratsbane, white arsenic.

arsenous oxide (noun)	arsenic trioxide (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