arsenous anhydride vs white arsenic

arsenous anhydride and white arsenic both are nouns.

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

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

arsenous anhydride 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 anhydride include arsenic, arsenic trioxide, arsenous oxide, ratsbane.

arsenous anhydride (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