arsenous oxide vs white arsenic

arsenous oxide and white arsenic both are nouns.

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

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

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

arsenous oxide (noun)	white arsenic (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